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Theorem volsup 23544
 Description: The volume of the limit of an increasing sequence of measurable sets is the limit of the volumes. (Contributed by Mario Carneiro, 14-Aug-2014.) (Revised by Mario Carneiro, 11-Dec-2016.)
Assertion
Ref Expression
volsup ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < ))
Distinct variable group:   𝑛,𝐹

Proof of Theorem volsup
Dummy variables 𝑗 𝑘 𝑚 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ffvelrn 6521 . . . . . . . . . . 11 ((𝐹:ℕ⟶dom vol ∧ 𝑘 ∈ ℕ) → (𝐹𝑘) ∈ dom vol)
21ad2ant2r 800 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ∈ dom vol)
3 fzofi 12987 . . . . . . . . . . 11 (1..^𝑘) ∈ Fin
4 simpll 807 . . . . . . . . . . . . 13 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝐹:ℕ⟶dom vol)
5 elfzouz 12688 . . . . . . . . . . . . . 14 (𝑚 ∈ (1..^𝑘) → 𝑚 ∈ (ℤ‘1))
6 nnuz 11936 . . . . . . . . . . . . . 14 ℕ = (ℤ‘1)
75, 6syl6eleqr 2850 . . . . . . . . . . . . 13 (𝑚 ∈ (1..^𝑘) → 𝑚 ∈ ℕ)
8 ffvelrn 6521 . . . . . . . . . . . . 13 ((𝐹:ℕ⟶dom vol ∧ 𝑚 ∈ ℕ) → (𝐹𝑚) ∈ dom vol)
94, 7, 8syl2an 495 . . . . . . . . . . . 12 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) ∧ 𝑚 ∈ (1..^𝑘)) → (𝐹𝑚) ∈ dom vol)
109ralrimiva 3104 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → ∀𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol)
11 finiunmbl 23532 . . . . . . . . . . 11 (((1..^𝑘) ∈ Fin ∧ ∀𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol) → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol)
123, 10, 11sylancr 698 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol)
13 difmbl 23531 . . . . . . . . . 10 (((𝐹𝑘) ∈ dom vol ∧ 𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol) → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol)
142, 12, 13syl2anc 696 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol)
15 mblvol 23518 . . . . . . . . . . 11 (((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol → (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = (vol*‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))
1614, 15syl 17 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = (vol*‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))
17 difssd 3881 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ⊆ (𝐹𝑘))
18 mblss 23519 . . . . . . . . . . . 12 ((𝐹𝑘) ∈ dom vol → (𝐹𝑘) ⊆ ℝ)
192, 18syl 17 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ⊆ ℝ)
20 mblvol 23518 . . . . . . . . . . . . 13 ((𝐹𝑘) ∈ dom vol → (vol‘(𝐹𝑘)) = (vol*‘(𝐹𝑘)))
212, 20syl 17 . . . . . . . . . . . 12 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) = (vol*‘(𝐹𝑘)))
22 simprr 813 . . . . . . . . . . . 12 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) ∈ ℝ)
2321, 22eqeltrrd 2840 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘(𝐹𝑘)) ∈ ℝ)
24 ovolsscl 23474 . . . . . . . . . . 11 ((((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ⊆ (𝐹𝑘) ∧ (𝐹𝑘) ⊆ ℝ ∧ (vol*‘(𝐹𝑘)) ∈ ℝ) → (vol*‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ)
2517, 19, 23, 24syl3anc 1477 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ)
2616, 25eqeltrd 2839 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ)
2714, 26jca 555 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol ∧ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ))
2827expr 644 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ 𝑘 ∈ ℕ) → ((vol‘(𝐹𝑘)) ∈ ℝ → (((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol ∧ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ)))
2928ralimdva 3100 . . . . . 6 ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ → ∀𝑘 ∈ ℕ (((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol ∧ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ)))
3029imp 444 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → ∀𝑘 ∈ ℕ (((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol ∧ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ))
31 fveq2 6353 . . . . . 6 (𝑘 = 𝑚 → (𝐹𝑘) = (𝐹𝑚))
3231iundisj2 23537 . . . . 5 Disj 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))
33 eqid 2760 . . . . . 6 seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) = seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))
34 eqid 2760 . . . . . 6 (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))) = (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))
3533, 34voliun 23542 . . . . 5 ((∀𝑘 ∈ ℕ (((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol ∧ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ) ∧ Disj 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) → (vol‘ 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = sup(ran seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))), ℝ*, < ))
3630, 32, 35sylancl 697 . . . 4 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (vol‘ 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = sup(ran seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))), ℝ*, < ))
3731iundisj 23536 . . . . . 6 𝑘 ∈ ℕ (𝐹𝑘) = 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))
38 ffn 6206 . . . . . . . 8 (𝐹:ℕ⟶dom vol → 𝐹 Fn ℕ)
3938ad2antrr 764 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → 𝐹 Fn ℕ)
40 fniunfv 6669 . . . . . . 7 (𝐹 Fn ℕ → 𝑘 ∈ ℕ (𝐹𝑘) = ran 𝐹)
4139, 40syl 17 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → 𝑘 ∈ ℕ (𝐹𝑘) = ran 𝐹)
4237, 41syl5eqr 2808 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = ran 𝐹)
4342fveq2d 6357 . . . 4 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (vol‘ 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = (vol‘ ran 𝐹))
44 1z 11619 . . . . . . . . . . 11 1 ∈ ℤ
45 seqfn 13027 . . . . . . . . . . 11 (1 ∈ ℤ → seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) Fn (ℤ‘1))
4644, 45ax-mp 5 . . . . . . . . . 10 seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) Fn (ℤ‘1)
476fneq2i 6147 . . . . . . . . . 10 (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) Fn ℕ ↔ seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) Fn (ℤ‘1))
4846, 47mpbir 221 . . . . . . . . 9 seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) Fn ℕ
4948a1i 11 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) Fn ℕ)
50 volf 23517 . . . . . . . . . 10 vol:dom vol⟶(0[,]+∞)
51 simpll 807 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → 𝐹:ℕ⟶dom vol)
52 fco 6219 . . . . . . . . . 10 ((vol:dom vol⟶(0[,]+∞) ∧ 𝐹:ℕ⟶dom vol) → (vol ∘ 𝐹):ℕ⟶(0[,]+∞))
5350, 51, 52sylancr 698 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (vol ∘ 𝐹):ℕ⟶(0[,]+∞))
54 ffn 6206 . . . . . . . . 9 ((vol ∘ 𝐹):ℕ⟶(0[,]+∞) → (vol ∘ 𝐹) Fn ℕ)
5553, 54syl 17 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (vol ∘ 𝐹) Fn ℕ)
56 fveq2 6353 . . . . . . . . . . . . 13 (𝑥 = 1 → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1))
57 fveq2 6353 . . . . . . . . . . . . . 14 (𝑥 = 1 → (𝐹𝑥) = (𝐹‘1))
5857fveq2d 6357 . . . . . . . . . . . . 13 (𝑥 = 1 → (vol‘(𝐹𝑥)) = (vol‘(𝐹‘1)))
5956, 58eqeq12d 2775 . . . . . . . . . . . 12 (𝑥 = 1 → ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (vol‘(𝐹𝑥)) ↔ (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = (vol‘(𝐹‘1))))
6059imbi2d 329 . . . . . . . . . . 11 (𝑥 = 1 → ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (vol‘(𝐹𝑥))) ↔ (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = (vol‘(𝐹‘1)))))
61 fveq2 6353 . . . . . . . . . . . . 13 (𝑥 = 𝑗 → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗))
62 fveq2 6353 . . . . . . . . . . . . . 14 (𝑥 = 𝑗 → (𝐹𝑥) = (𝐹𝑗))
6362fveq2d 6357 . . . . . . . . . . . . 13 (𝑥 = 𝑗 → (vol‘(𝐹𝑥)) = (vol‘(𝐹𝑗)))
6461, 63eqeq12d 2775 . . . . . . . . . . . 12 (𝑥 = 𝑗 → ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (vol‘(𝐹𝑥)) ↔ (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = (vol‘(𝐹𝑗))))
6564imbi2d 329 . . . . . . . . . . 11 (𝑥 = 𝑗 → ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (vol‘(𝐹𝑥))) ↔ (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = (vol‘(𝐹𝑗)))))
66 fveq2 6353 . . . . . . . . . . . . 13 (𝑥 = (𝑗 + 1) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)))
67 fveq2 6353 . . . . . . . . . . . . . 14 (𝑥 = (𝑗 + 1) → (𝐹𝑥) = (𝐹‘(𝑗 + 1)))
6867fveq2d 6357 . . . . . . . . . . . . 13 (𝑥 = (𝑗 + 1) → (vol‘(𝐹𝑥)) = (vol‘(𝐹‘(𝑗 + 1))))
6966, 68eqeq12d 2775 . . . . . . . . . . . 12 (𝑥 = (𝑗 + 1) → ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (vol‘(𝐹𝑥)) ↔ (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = (vol‘(𝐹‘(𝑗 + 1)))))
7069imbi2d 329 . . . . . . . . . . 11 (𝑥 = (𝑗 + 1) → ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (vol‘(𝐹𝑥))) ↔ (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = (vol‘(𝐹‘(𝑗 + 1))))))
71 seq1 13028 . . . . . . . . . . . . . 14 (1 ∈ ℤ → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘1))
7244, 71ax-mp 5 . . . . . . . . . . . . 13 (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘1)
73 1nn 11243 . . . . . . . . . . . . . 14 1 ∈ ℕ
74 oveq2 6822 . . . . . . . . . . . . . . . . . . . . . 22 (𝑘 = 1 → (1..^𝑘) = (1..^1))
75 fzo0 12706 . . . . . . . . . . . . . . . . . . . . . 22 (1..^1) = ∅
7674, 75syl6eq 2810 . . . . . . . . . . . . . . . . . . . . 21 (𝑘 = 1 → (1..^𝑘) = ∅)
7776iuneq1d 4697 . . . . . . . . . . . . . . . . . . . 20 (𝑘 = 1 → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) = 𝑚 ∈ ∅ (𝐹𝑚))
78 0iun 4729 . . . . . . . . . . . . . . . . . . . 20 𝑚 ∈ ∅ (𝐹𝑚) = ∅
7977, 78syl6eq 2810 . . . . . . . . . . . . . . . . . . 19 (𝑘 = 1 → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) = ∅)
8079difeq2d 3871 . . . . . . . . . . . . . . . . . 18 (𝑘 = 1 → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = ((𝐹𝑘) ∖ ∅))
81 dif0 4093 . . . . . . . . . . . . . . . . . 18 ((𝐹𝑘) ∖ ∅) = (𝐹𝑘)
8280, 81syl6eq 2810 . . . . . . . . . . . . . . . . 17 (𝑘 = 1 → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = (𝐹𝑘))
83 fveq2 6353 . . . . . . . . . . . . . . . . 17 (𝑘 = 1 → (𝐹𝑘) = (𝐹‘1))
8482, 83eqtrd 2794 . . . . . . . . . . . . . . . 16 (𝑘 = 1 → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = (𝐹‘1))
8584fveq2d 6357 . . . . . . . . . . . . . . 15 (𝑘 = 1 → (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = (vol‘(𝐹‘1)))
86 fvex 6363 . . . . . . . . . . . . . . 15 (vol‘(𝐹‘1)) ∈ V
8785, 34, 86fvmpt 6445 . . . . . . . . . . . . . 14 (1 ∈ ℕ → ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘1) = (vol‘(𝐹‘1)))
8873, 87ax-mp 5 . . . . . . . . . . . . 13 ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘1) = (vol‘(𝐹‘1))
8972, 88eqtri 2782 . . . . . . . . . . . 12 (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = (vol‘(𝐹‘1))
9089a1i 11 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = (vol‘(𝐹‘1)))
91 oveq1 6821 . . . . . . . . . . . . . 14 ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = (vol‘(𝐹𝑗)) → ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1))) = ((vol‘(𝐹𝑗)) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1))))
92 seqp1 13030 . . . . . . . . . . . . . . . . 17 (𝑗 ∈ (ℤ‘1) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1))))
9392, 6eleq2s 2857 . . . . . . . . . . . . . . . 16 (𝑗 ∈ ℕ → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1))))
9493adantl 473 . . . . . . . . . . . . . . 15 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1))))
95 undif2 4188 . . . . . . . . . . . . . . . . . 18 ((𝐹𝑗) ∪ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = ((𝐹𝑗) ∪ (𝐹‘(𝑗 + 1)))
96 fveq2 6353 . . . . . . . . . . . . . . . . . . . . 21 (𝑛 = 𝑗 → (𝐹𝑛) = (𝐹𝑗))
97 oveq1 6821 . . . . . . . . . . . . . . . . . . . . . 22 (𝑛 = 𝑗 → (𝑛 + 1) = (𝑗 + 1))
9897fveq2d 6357 . . . . . . . . . . . . . . . . . . . . 21 (𝑛 = 𝑗 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑗 + 1)))
9996, 98sseq12d 3775 . . . . . . . . . . . . . . . . . . . 20 (𝑛 = 𝑗 → ((𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1)) ↔ (𝐹𝑗) ⊆ (𝐹‘(𝑗 + 1))))
100 simpllr 817 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1)))
101 simpr 479 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℕ)
10299, 100, 101rspcdva 3455 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹𝑗) ⊆ (𝐹‘(𝑗 + 1)))
103 ssequn1 3926 . . . . . . . . . . . . . . . . . . 19 ((𝐹𝑗) ⊆ (𝐹‘(𝑗 + 1)) ↔ ((𝐹𝑗) ∪ (𝐹‘(𝑗 + 1))) = (𝐹‘(𝑗 + 1)))
104102, 103sylib 208 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((𝐹𝑗) ∪ (𝐹‘(𝑗 + 1))) = (𝐹‘(𝑗 + 1)))
10595, 104syl5req 2807 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹‘(𝑗 + 1)) = ((𝐹𝑗) ∪ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))))
106105fveq2d 6357 . . . . . . . . . . . . . . . 16 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘(𝐹‘(𝑗 + 1))) = (vol‘((𝐹𝑗) ∪ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)))))
107 simplll 815 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝐹:ℕ⟶dom vol)
108107, 101ffvelrnd 6524 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹𝑗) ∈ dom vol)
109 peano2nn 11244 . . . . . . . . . . . . . . . . . . . 20 (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℕ)
110109adantl 473 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝑗 + 1) ∈ ℕ)
111107, 110ffvelrnd 6524 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹‘(𝑗 + 1)) ∈ dom vol)
112 difmbl 23531 . . . . . . . . . . . . . . . . . 18 (((𝐹‘(𝑗 + 1)) ∈ dom vol ∧ (𝐹𝑗) ∈ dom vol) → ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ∈ dom vol)
113111, 108, 112syl2anc 696 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ∈ dom vol)
114 disjdif 4184 . . . . . . . . . . . . . . . . . 18 ((𝐹𝑗) ∩ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = ∅
115114a1i 11 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((𝐹𝑗) ∩ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = ∅)
116 fveq2 6353 . . . . . . . . . . . . . . . . . . . 20 (𝑘 = 𝑗 → (𝐹𝑘) = (𝐹𝑗))
117116fveq2d 6357 . . . . . . . . . . . . . . . . . . 19 (𝑘 = 𝑗 → (vol‘(𝐹𝑘)) = (vol‘(𝐹𝑗)))
118117eleq1d 2824 . . . . . . . . . . . . . . . . . 18 (𝑘 = 𝑗 → ((vol‘(𝐹𝑘)) ∈ ℝ ↔ (vol‘(𝐹𝑗)) ∈ ℝ))
119 simplr 809 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ)
120118, 119, 101rspcdva 3455 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘(𝐹𝑗)) ∈ ℝ)
121 mblvol 23518 . . . . . . . . . . . . . . . . . . 19 (((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ∈ dom vol → (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = (vol*‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))))
122113, 121syl 17 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = (vol*‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))))
123 difssd 3881 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ⊆ (𝐹‘(𝑗 + 1)))
124 mblss 23519 . . . . . . . . . . . . . . . . . . . 20 ((𝐹‘(𝑗 + 1)) ∈ dom vol → (𝐹‘(𝑗 + 1)) ⊆ ℝ)
125111, 124syl 17 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹‘(𝑗 + 1)) ⊆ ℝ)
126 mblvol 23518 . . . . . . . . . . . . . . . . . . . . 21 ((𝐹‘(𝑗 + 1)) ∈ dom vol → (vol‘(𝐹‘(𝑗 + 1))) = (vol*‘(𝐹‘(𝑗 + 1))))
127111, 126syl 17 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘(𝐹‘(𝑗 + 1))) = (vol*‘(𝐹‘(𝑗 + 1))))
128 fveq2 6353 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑘 = (𝑗 + 1) → (𝐹𝑘) = (𝐹‘(𝑗 + 1)))
129128fveq2d 6357 . . . . . . . . . . . . . . . . . . . . . 22 (𝑘 = (𝑗 + 1) → (vol‘(𝐹𝑘)) = (vol‘(𝐹‘(𝑗 + 1))))
130129eleq1d 2824 . . . . . . . . . . . . . . . . . . . . 21 (𝑘 = (𝑗 + 1) → ((vol‘(𝐹𝑘)) ∈ ℝ ↔ (vol‘(𝐹‘(𝑗 + 1))) ∈ ℝ))
131130, 119, 110rspcdva 3455 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘(𝐹‘(𝑗 + 1))) ∈ ℝ)
132127, 131eqeltrrd 2840 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol*‘(𝐹‘(𝑗 + 1))) ∈ ℝ)
133 ovolsscl 23474 . . . . . . . . . . . . . . . . . . 19 ((((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ⊆ (𝐹‘(𝑗 + 1)) ∧ (𝐹‘(𝑗 + 1)) ⊆ ℝ ∧ (vol*‘(𝐹‘(𝑗 + 1))) ∈ ℝ) → (vol*‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) ∈ ℝ)
134123, 125, 132, 133syl3anc 1477 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol*‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) ∈ ℝ)
135122, 134eqeltrd 2839 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) ∈ ℝ)
136 volun 23533 . . . . . . . . . . . . . . . . 17 ((((𝐹𝑗) ∈ dom vol ∧ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ∈ dom vol ∧ ((𝐹𝑗) ∩ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = ∅) ∧ ((vol‘(𝐹𝑗)) ∈ ℝ ∧ (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) ∈ ℝ)) → (vol‘((𝐹𝑗) ∪ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)))) = ((vol‘(𝐹𝑗)) + (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)))))
137108, 113, 115, 120, 135, 136syl32anc 1485 . . . . . . . . . . . . . . . 16 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘((𝐹𝑗) ∪ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)))) = ((vol‘(𝐹𝑗)) + (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)))))
138100adantr 472 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) ∧ 𝑚 ∈ (1...𝑗)) → ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1)))
139 elfznn 12583 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝑚 ∈ (1...𝑗) → 𝑚 ∈ ℕ)
140139adantl 473 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) ∧ 𝑚 ∈ (1...𝑗)) → 𝑚 ∈ ℕ)
141 elfzuz3 12552 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝑚 ∈ (1...𝑗) → 𝑗 ∈ (ℤ𝑚))
142141adantl 473 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) ∧ 𝑚 ∈ (1...𝑗)) → 𝑗 ∈ (ℤ𝑚))
143 volsuplem 23543 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1)) ∧ (𝑚 ∈ ℕ ∧ 𝑗 ∈ (ℤ𝑚))) → (𝐹𝑚) ⊆ (𝐹𝑗))
144138, 140, 142, 143syl12anc 1475 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) ∧ 𝑚 ∈ (1...𝑗)) → (𝐹𝑚) ⊆ (𝐹𝑗))
145144ralrimiva 3104 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ∀𝑚 ∈ (1...𝑗)(𝐹𝑚) ⊆ (𝐹𝑗))
146 iunss 4713 . . . . . . . . . . . . . . . . . . . . . . 23 ( 𝑚 ∈ (1...𝑗)(𝐹𝑚) ⊆ (𝐹𝑗) ↔ ∀𝑚 ∈ (1...𝑗)(𝐹𝑚) ⊆ (𝐹𝑗))
147145, 146sylibr 224 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑚 ∈ (1...𝑗)(𝐹𝑚) ⊆ (𝐹𝑗))
148101, 6syl6eleq 2849 . . . . . . . . . . . . . . . . . . . . . . . 24 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ (ℤ‘1))
149 eluzfz2 12562 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑗 ∈ (ℤ‘1) → 𝑗 ∈ (1...𝑗))
150148, 149syl 17 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ (1...𝑗))
151 fveq2 6353 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑚 = 𝑗 → (𝐹𝑚) = (𝐹𝑗))
152151ssiun2s 4716 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑗 ∈ (1...𝑗) → (𝐹𝑗) ⊆ 𝑚 ∈ (1...𝑗)(𝐹𝑚))
153150, 152syl 17 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹𝑗) ⊆ 𝑚 ∈ (1...𝑗)(𝐹𝑚))
154147, 153eqssd 3761 . . . . . . . . . . . . . . . . . . . . 21 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑚 ∈ (1...𝑗)(𝐹𝑚) = (𝐹𝑗))
155101nnzd 11693 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℤ)
156 fzval3 12751 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑗 ∈ ℤ → (1...𝑗) = (1..^(𝑗 + 1)))
157155, 156syl 17 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (1...𝑗) = (1..^(𝑗 + 1)))
158157iuneq1d 4697 . . . . . . . . . . . . . . . . . . . . 21 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑚 ∈ (1...𝑗)(𝐹𝑚) = 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))
159154, 158eqtr3d 2796 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹𝑗) = 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))
160159difeq2d 3871 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) = ((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚)))
161160fveq2d 6357 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = (vol‘((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))))
162 oveq2 6822 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑘 = (𝑗 + 1) → (1..^𝑘) = (1..^(𝑗 + 1)))
163162iuneq1d 4697 . . . . . . . . . . . . . . . . . . . . . 22 (𝑘 = (𝑗 + 1) → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) = 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))
164128, 163difeq12d 3872 . . . . . . . . . . . . . . . . . . . . 21 (𝑘 = (𝑗 + 1) → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = ((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚)))
165164fveq2d 6357 . . . . . . . . . . . . . . . . . . . 20 (𝑘 = (𝑗 + 1) → (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = (vol‘((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))))
166 fvex 6363 . . . . . . . . . . . . . . . . . . . 20 (vol‘((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))) ∈ V
167165, 34, 166fvmpt 6445 . . . . . . . . . . . . . . . . . . 19 ((𝑗 + 1) ∈ ℕ → ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1)) = (vol‘((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))))
168110, 167syl 17 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1)) = (vol‘((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))))
169161, 168eqtr4d 2797 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1)))
170169oveq2d 6830 . . . . . . . . . . . . . . . 16 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((vol‘(𝐹𝑗)) + (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)))) = ((vol‘(𝐹𝑗)) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1))))
171106, 137, 1703eqtrd 2798 . . . . . . . . . . . . . . 15 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘(𝐹‘(𝑗 + 1))) = ((vol‘(𝐹𝑗)) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1))))
17294, 171eqeq12d 2775 . . . . . . . . . . . . . 14 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = (vol‘(𝐹‘(𝑗 + 1))) ↔ ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1))) = ((vol‘(𝐹𝑗)) + ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1)))))
17391, 172syl5ibr 236 . . . . . . . . . . . . 13 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = (vol‘(𝐹𝑗)) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = (vol‘(𝐹‘(𝑗 + 1)))))
174173expcom 450 . . . . . . . . . . . 12 (𝑗 ∈ ℕ → (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → ((seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = (vol‘(𝐹𝑗)) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = (vol‘(𝐹‘(𝑗 + 1))))))
175174a2d 29 . . . . . . . . . . 11 (𝑗 ∈ ℕ → ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = (vol‘(𝐹𝑗))) → (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘(𝑗 + 1)) = (vol‘(𝐹‘(𝑗 + 1))))))
17660, 65, 70, 65, 90, 175nnind 11250 . . . . . . . . . 10 (𝑗 ∈ ℕ → (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = (vol‘(𝐹𝑗))))
177176impcom 445 . . . . . . . . 9 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = (vol‘(𝐹𝑗)))
178 fvco3 6438 . . . . . . . . . 10 ((𝐹:ℕ⟶dom vol ∧ 𝑗 ∈ ℕ) → ((vol ∘ 𝐹)‘𝑗) = (vol‘(𝐹𝑗)))
17951, 178sylan 489 . . . . . . . . 9 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((vol ∘ 𝐹)‘𝑗) = (vol‘(𝐹𝑗)))
180177, 179eqtr4d 2797 . . . . . . . 8 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗) = ((vol ∘ 𝐹)‘𝑗))
18149, 55, 180eqfnfvd 6478 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) = (vol ∘ 𝐹))
182181rneqd 5508 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → ran seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) = ran (vol ∘ 𝐹))
183 rnco2 5803 . . . . . 6 ran (vol ∘ 𝐹) = (vol “ ran 𝐹)
184182, 183syl6eq 2810 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → ran seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) = (vol “ ran 𝐹))
185184supeq1d 8519 . . . 4 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → sup(ran seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))), ℝ*, < ) = sup((vol “ ran 𝐹), ℝ*, < ))
18636, 43, 1853eqtr3d 2802 . . 3 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < ))
187186ex 449 . 2 ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < )))
188 rexnal 3133 . . 3 (∃𝑘 ∈ ℕ ¬ (vol‘(𝐹𝑘)) ∈ ℝ ↔ ¬ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ)
189 fniunfv 6669 . . . . . . . . . . . 12 (𝐹 Fn ℕ → 𝑛 ∈ ℕ (𝐹𝑛) = ran 𝐹)
19038, 189syl 17 . . . . . . . . . . 11 (𝐹:ℕ⟶dom vol → 𝑛 ∈ ℕ (𝐹𝑛) = ran 𝐹)
191 ffvelrn 6521 . . . . . . . . . . . . 13 ((𝐹:ℕ⟶dom vol ∧ 𝑛 ∈ ℕ) → (𝐹𝑛) ∈ dom vol)
192191ralrimiva 3104 . . . . . . . . . . . 12 (𝐹:ℕ⟶dom vol → ∀𝑛 ∈ ℕ (𝐹𝑛) ∈ dom vol)
193 iunmbl 23541 . . . . . . . . . . . 12 (∀𝑛 ∈ ℕ (𝐹𝑛) ∈ dom vol → 𝑛 ∈ ℕ (𝐹𝑛) ∈ dom vol)
194192, 193syl 17 . . . . . . . . . . 11 (𝐹:ℕ⟶dom vol → 𝑛 ∈ ℕ (𝐹𝑛) ∈ dom vol)
195190, 194eqeltrrd 2840 . . . . . . . . . 10 (𝐹:ℕ⟶dom vol → ran 𝐹 ∈ dom vol)
196195ad2antrr 764 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ran 𝐹 ∈ dom vol)
197 mblss 23519 . . . . . . . . 9 ( ran 𝐹 ∈ dom vol → ran 𝐹 ⊆ ℝ)
198196, 197syl 17 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ran 𝐹 ⊆ ℝ)
199 ovolcl 23466 . . . . . . . 8 ( ran 𝐹 ⊆ ℝ → (vol*‘ ran 𝐹) ∈ ℝ*)
200198, 199syl 17 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘ ran 𝐹) ∈ ℝ*)
201 pnfge 12177 . . . . . . 7 ((vol*‘ ran 𝐹) ∈ ℝ* → (vol*‘ ran 𝐹) ≤ +∞)
202200, 201syl 17 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘ ran 𝐹) ≤ +∞)
203 simprr 813 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ¬ (vol‘(𝐹𝑘)) ∈ ℝ)
2041ad2ant2r 800 . . . . . . . . . . . . 13 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ∈ dom vol)
205204, 18syl 17 . . . . . . . . . . . 12 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ⊆ ℝ)
206 ovolcl 23466 . . . . . . . . . . . 12 ((𝐹𝑘) ⊆ ℝ → (vol*‘(𝐹𝑘)) ∈ ℝ*)
207205, 206syl 17 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘(𝐹𝑘)) ∈ ℝ*)
208 xrrebnd 12212 . . . . . . . . . . 11 ((vol*‘(𝐹𝑘)) ∈ ℝ* → ((vol*‘(𝐹𝑘)) ∈ ℝ ↔ (-∞ < (vol*‘(𝐹𝑘)) ∧ (vol*‘(𝐹𝑘)) < +∞)))
209207, 208syl 17 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol*‘(𝐹𝑘)) ∈ ℝ ↔ (-∞ < (vol*‘(𝐹𝑘)) ∧ (vol*‘(𝐹𝑘)) < +∞)))
210204, 20syl 17 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) = (vol*‘(𝐹𝑘)))
211210eleq1d 2824 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol‘(𝐹𝑘)) ∈ ℝ ↔ (vol*‘(𝐹𝑘)) ∈ ℝ))
212 ovolge0 23469 . . . . . . . . . . . . 13 ((𝐹𝑘) ⊆ ℝ → 0 ≤ (vol*‘(𝐹𝑘)))
213 mnflt0 12172 . . . . . . . . . . . . . 14 -∞ < 0
214 mnfxr 10308 . . . . . . . . . . . . . . 15 -∞ ∈ ℝ*
215 0xr 10298 . . . . . . . . . . . . . . 15 0 ∈ ℝ*
216 xrltletr 12201 . . . . . . . . . . . . . . 15 ((-∞ ∈ ℝ* ∧ 0 ∈ ℝ* ∧ (vol*‘(𝐹𝑘)) ∈ ℝ*) → ((-∞ < 0 ∧ 0 ≤ (vol*‘(𝐹𝑘))) → -∞ < (vol*‘(𝐹𝑘))))
217214, 215, 216mp3an12 1563 . . . . . . . . . . . . . 14 ((vol*‘(𝐹𝑘)) ∈ ℝ* → ((-∞ < 0 ∧ 0 ≤ (vol*‘(𝐹𝑘))) → -∞ < (vol*‘(𝐹𝑘))))
218213, 217mpani 714 . . . . . . . . . . . . 13 ((vol*‘(𝐹𝑘)) ∈ ℝ* → (0 ≤ (vol*‘(𝐹𝑘)) → -∞ < (vol*‘(𝐹𝑘))))
219206, 212, 218sylc 65 . . . . . . . . . . . 12 ((𝐹𝑘) ⊆ ℝ → -∞ < (vol*‘(𝐹𝑘)))
220205, 219syl 17 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → -∞ < (vol*‘(𝐹𝑘)))
221220biantrurd 530 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol*‘(𝐹𝑘)) < +∞ ↔ (-∞ < (vol*‘(𝐹𝑘)) ∧ (vol*‘(𝐹𝑘)) < +∞)))
222209, 211, 2213bitr4d 300 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol‘(𝐹𝑘)) ∈ ℝ ↔ (vol*‘(𝐹𝑘)) < +∞))
223203, 222mtbid 313 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ¬ (vol*‘(𝐹𝑘)) < +∞)
224 nltpnft 12208 . . . . . . . . 9 ((vol*‘(𝐹𝑘)) ∈ ℝ* → ((vol*‘(𝐹𝑘)) = +∞ ↔ ¬ (vol*‘(𝐹𝑘)) < +∞))
225207, 224syl 17 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol*‘(𝐹𝑘)) = +∞ ↔ ¬ (vol*‘(𝐹𝑘)) < +∞))
226223, 225mpbird 247 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘(𝐹𝑘)) = +∞)
22738ad2antrr 764 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝐹 Fn ℕ)
228 simprl 811 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝑘 ∈ ℕ)
229 fnfvelrn 6520 . . . . . . . . . 10 ((𝐹 Fn ℕ ∧ 𝑘 ∈ ℕ) → (𝐹𝑘) ∈ ran 𝐹)
230227, 228, 229syl2anc 696 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ∈ ran 𝐹)
231 elssuni 4619 . . . . . . . . 9 ((𝐹𝑘) ∈ ran 𝐹 → (𝐹𝑘) ⊆ ran 𝐹)
232230, 231syl 17 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ⊆ ran 𝐹)
233 ovolss 23473 . . . . . . . 8 (((𝐹𝑘) ⊆ ran 𝐹 ran 𝐹 ⊆ ℝ) → (vol*‘(𝐹𝑘)) ≤ (vol*‘ ran 𝐹))
234232, 198, 233syl2anc 696 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘(𝐹𝑘)) ≤ (vol*‘ ran 𝐹))
235226, 234eqbrtrrd 4828 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → +∞ ≤ (vol*‘ ran 𝐹))
236 pnfxr 10304 . . . . . . 7 +∞ ∈ ℝ*
237 xrletri3 12198 . . . . . . 7 (((vol*‘ ran 𝐹) ∈ ℝ* ∧ +∞ ∈ ℝ*) → ((vol*‘ ran 𝐹) = +∞ ↔ ((vol*‘ ran 𝐹) ≤ +∞ ∧ +∞ ≤ (vol*‘ ran 𝐹))))
238200, 236, 237sylancl 697 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol*‘ ran 𝐹) = +∞ ↔ ((vol*‘ ran 𝐹) ≤ +∞ ∧ +∞ ≤ (vol*‘ ran 𝐹))))
239202, 235, 238mpbir2and 995 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘ ran 𝐹) = +∞)
240 mblvol 23518 . . . . . 6 ( ran 𝐹 ∈ dom vol → (vol‘ ran 𝐹) = (vol*‘ ran 𝐹))
241196, 240syl 17 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘ ran 𝐹) = (vol*‘ ran 𝐹))
242 imassrn 5635 . . . . . . 7 (vol “ ran 𝐹) ⊆ ran vol
243 frn 6214 . . . . . . . . 9 (vol:dom vol⟶(0[,]+∞) → ran vol ⊆ (0[,]+∞))
24450, 243ax-mp 5 . . . . . . . 8 ran vol ⊆ (0[,]+∞)
245 iccssxr 12469 . . . . . . . 8 (0[,]+∞) ⊆ ℝ*
246244, 245sstri 3753 . . . . . . 7 ran vol ⊆ ℝ*
247242, 246sstri 3753 . . . . . 6 (vol “ ran 𝐹) ⊆ ℝ*
248210, 226eqtrd 2794 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) = +∞)
249 simpll 807 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝐹:ℕ⟶dom vol)
250 ffun 6209 . . . . . . . . . 10 (vol:dom vol⟶(0[,]+∞) → Fun vol)
25150, 250ax-mp 5 . . . . . . . . 9 Fun vol
252 frn 6214 . . . . . . . . 9 (𝐹:ℕ⟶dom vol → ran 𝐹 ⊆ dom vol)
253 funfvima2 6657 . . . . . . . . 9 ((Fun vol ∧ ran 𝐹 ⊆ dom vol) → ((𝐹𝑘) ∈ ran 𝐹 → (vol‘(𝐹𝑘)) ∈ (vol “ ran 𝐹)))
254251, 252, 253sylancr 698 . . . . . . . 8 (𝐹:ℕ⟶dom vol → ((𝐹𝑘) ∈ ran 𝐹 → (vol‘(𝐹𝑘)) ∈ (vol “ ran 𝐹)))
255249, 230, 254sylc 65 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) ∈ (vol “ ran 𝐹))
256248, 255eqeltrrd 2840 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → +∞ ∈ (vol “ ran 𝐹))
257 supxrpnf 12361 . . . . . 6 (((vol “ ran 𝐹) ⊆ ℝ* ∧ +∞ ∈ (vol “ ran 𝐹)) → sup((vol “ ran 𝐹), ℝ*, < ) = +∞)
258247, 256, 257sylancr 698 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → sup((vol “ ran 𝐹), ℝ*, < ) = +∞)
259239, 241, 2583eqtr4d 2804 . . . 4 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < ))
260259rexlimdvaa 3170 . . 3 ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (∃𝑘 ∈ ℕ ¬ (vol‘(𝐹𝑘)) ∈ ℝ → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < )))
261188, 260syl5bir 233 . 2 ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (¬ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < )))
262187, 261pm2.61d 170 1 ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < ))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 383   = wceq 1632   ∈ wcel 2139  ∀wral 3050  ∃wrex 3051   ∖ cdif 3712   ∪ cun 3713   ∩ cin 3714   ⊆ wss 3715  ∅c0 4058  ∪ cuni 4588  ∪ ciun 4672  Disj wdisj 4772   class class class wbr 4804   ↦ cmpt 4881  dom cdm 5266  ran crn 5267   “ cima 5269   ∘ ccom 5270  Fun wfun 6043   Fn wfn 6044  ⟶wf 6045  ‘cfv 6049  (class class class)co 6814  Fincfn 8123  supcsup 8513  ℝcr 10147  0cc0 10148  1c1 10149   + caddc 10151  +∞cpnf 10283  -∞cmnf 10284  ℝ*cxr 10285   < clt 10286   ≤ cle 10287  ℕcn 11232  ℤcz 11589  ℤ≥cuz 11899  [,]cicc 12391  ...cfz 12539  ..^cfzo 12679  seqcseq 13015  vol*covol 23451  volcvol 23452 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-rep 4923  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7115  ax-inf2 8713  ax-cc 9469  ax-cnex 10204  ax-resscn 10205  ax-1cn 10206  ax-icn 10207  ax-addcl 10208  ax-addrcl 10209  ax-mulcl 10210  ax-mulrcl 10211  ax-mulcom 10212  ax-addass 10213  ax-mulass 10214  ax-distr 10215  ax-i2m1 10216  ax-1ne0 10217  ax-1rid 10218  ax-rnegex 10219  ax-rrecex 10220  ax-cnre 10221  ax-pre-lttri 10222  ax-pre-lttrn 10223  ax-pre-ltadd 10224  ax-pre-mulgt0 10225  ax-pre-sup 10226 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1635  df-fal 1638  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-nel 3036  df-ral 3055  df-rex 3056  df-reu 3057  df-rmo 3058  df-rab 3059  df-v 3342  df-sbc 3577  df-csb 3675  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-pss 3731  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-tp 4326  df-op 4328  df-uni 4589  df-int 4628  df-iun 4674  df-disj 4773  df-br 4805  df-opab 4865  df-mpt 4882  df-tr 4905  df-id 5174  df-eprel 5179  df-po 5187  df-so 5188  df-fr 5225  df-se 5226  df-we 5227  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-pred 5841  df-ord 5887  df-on 5888  df-lim 5889  df-suc 5890  df-iota 6012  df-fun 6051  df-fn 6052  df-f 6053  df-f1 6054  df-fo 6055  df-f1o 6056  df-fv 6057  df-isom 6058  df-riota 6775  df-ov 6817  df-oprab 6818  df-mpt2 6819  df-of 7063  df-om 7232  df-1st 7334  df-2nd 7335  df-wrecs 7577  df-recs 7638  df-rdg 7676  df-1o 7730  df-2o 7731  df-oadd 7734  df-er 7913  df-map 8027  df-pm 8028  df-en 8124  df-dom 8125  df-sdom 8126  df-fin 8127  df-sup 8515  df-inf 8516  df-oi 8582  df-card 8975  df-cda 9202  df-pnf 10288  df-mnf 10289  df-xr 10290  df-ltxr 10291  df-le 10292  df-sub 10480  df-neg 10481  df-div 10897  df-nn 11233  df-2 11291  df-3 11292  df-n0 11505  df-z 11590  df-uz 11900  df-q 12002  df-rp 12046  df-xadd 12160  df-ioo 12392  df-ico 12394  df-icc 12395  df-fz 12540  df-fzo 12680  df-fl 12807  df-seq 13016  df-exp 13075  df-hash 13332  df-cj 14058  df-re 14059  df-im 14060  df-sqrt 14194  df-abs 14195  df-clim 14438  df-rlim 14439  df-sum 14636  df-xmet 19961  df-met 19962  df-ovol 23453  df-vol 23454 This theorem is referenced by:  volsup2  23593  itg1climres  23700  itg2gt0  23746
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