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Theorem volsup 24164
 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 6830 . . . . . . . . . . 11 ((𝐹:ℕ⟶dom vol ∧ 𝑘 ∈ ℕ) → (𝐹𝑘) ∈ dom vol)
21ad2ant2r 746 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ∈ dom vol)
3 fzofi 13341 . . . . . . . . . . 11 (1..^𝑘) ∈ Fin
4 simpll 766 . . . . . . . . . . . . 13 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝐹:ℕ⟶dom vol)
5 elfzouz 13041 . . . . . . . . . . . . . 14 (𝑚 ∈ (1..^𝑘) → 𝑚 ∈ (ℤ‘1))
6 nnuz 12273 . . . . . . . . . . . . . 14 ℕ = (ℤ‘1)
75, 6eleqtrrdi 2904 . . . . . . . . . . . . 13 (𝑚 ∈ (1..^𝑘) → 𝑚 ∈ ℕ)
8 ffvelrn 6830 . . . . . . . . . . . . 13 ((𝐹:ℕ⟶dom vol ∧ 𝑚 ∈ ℕ) → (𝐹𝑚) ∈ dom vol)
94, 7, 8syl2an 598 . . . . . . . . . . . 12 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) ∧ 𝑚 ∈ (1..^𝑘)) → (𝐹𝑚) ∈ dom vol)
109ralrimiva 3152 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → ∀𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol)
11 finiunmbl 24152 . . . . . . . . . . 11 (((1..^𝑘) ∈ Fin ∧ ∀𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol) → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol)
123, 10, 11sylancr 590 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol)
13 difmbl 24151 . . . . . . . . . 10 (((𝐹𝑘) ∈ dom vol ∧ 𝑚 ∈ (1..^𝑘)(𝐹𝑚) ∈ dom vol) → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ∈ dom vol)
142, 12, 13syl2anc 587 . . . . . . . . 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 24138 . . . . . . . . . . 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 4063 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ⊆ (𝐹𝑘))
18 mblss 24139 . . . . . . . . . . . 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 24138 . . . . . . . . . . . . 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 772 . . . . . . . . . . . 12 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) ∈ ℝ)
2321, 22eqeltrrd 2894 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘(𝐹𝑘)) ∈ ℝ)
24 ovolsscl 24094 . . . . . . . . . . 11 ((((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) ⊆ (𝐹𝑘) ∧ (𝐹𝑘) ⊆ ℝ ∧ (vol*‘(𝐹𝑘)) ∈ ℝ) → (vol*‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) ∈ ℝ)
2517, 19, 23, 24syl3anc 1368 . . . . . . . . . 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 2893 . . . . . . . . 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 515 . . . . . . . 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 460 . . . . . . 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 3147 . . . . . 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 410 . . . . 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 6649 . . . . . 6 (𝑘 = 𝑚 → (𝐹𝑘) = (𝐹𝑚))
3231iundisj2 24157 . . . . 5 Disj 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))
33 eqid 2801 . . . . . 6 seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))) = seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))
34 eqid 2801 . . . . . 6 (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))) = (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))
3533, 34voliun 24162 . . . . 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 589 . . . 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 24156 . . . . . 6 𝑘 ∈ ℕ (𝐹𝑘) = 𝑘 ∈ ℕ ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))
38 ffn 6491 . . . . . . . 8 (𝐹:ℕ⟶dom vol → 𝐹 Fn ℕ)
3938ad2antrr 725 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → 𝐹 Fn ℕ)
40 fniunfv 6988 . . . . . . 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 2850 . . . . 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 6653 . . . 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 12004 . . . . . . . . . . 11 1 ∈ ℤ
45 seqfn 13380 . . . . . . . . . . 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 6425 . . . . . . . . . 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 234 . . . . . . . . 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 24137 . . . . . . . . . 10 vol:dom vol⟶(0[,]+∞)
51 simpll 766 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → 𝐹:ℕ⟶dom vol)
52 fco 6509 . . . . . . . . . 10 ((vol:dom vol⟶(0[,]+∞) ∧ 𝐹:ℕ⟶dom vol) → (vol ∘ 𝐹):ℕ⟶(0[,]+∞))
5350, 51, 52sylancr 590 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (vol ∘ 𝐹):ℕ⟶(0[,]+∞))
5453ffnd 6492 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (vol ∘ 𝐹) Fn ℕ)
55 fveq2 6649 . . . . . . . . . . . . 13 (𝑥 = 1 → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1))
56 2fveq3 6654 . . . . . . . . . . . . 13 (𝑥 = 1 → (vol‘(𝐹𝑥)) = (vol‘(𝐹‘1)))
5755, 56eqeq12d 2817 . . . . . . . . . . . 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))))
5857imbi2d 344 . . . . . . . . . . 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)))))
59 fveq2 6649 . . . . . . . . . . . . 13 (𝑥 = 𝑗 → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑥) = (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘𝑗))
60 2fveq3 6654 . . . . . . . . . . . . 13 (𝑥 = 𝑗 → (vol‘(𝐹𝑥)) = (vol‘(𝐹𝑗)))
6159, 60eqeq12d 2817 . . . . . . . . . . . 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))))
6261imbi2d 344 . . . . . . . . . . 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)))))
63 fveq2 6649 . . . . . . . . . . . . 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)))
64 2fveq3 6654 . . . . . . . . . . . . 13 (𝑥 = (𝑗 + 1) → (vol‘(𝐹𝑥)) = (vol‘(𝐹‘(𝑗 + 1))))
6563, 64eqeq12d 2817 . . . . . . . . . . . 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)))))
6665imbi2d 344 . . . . . . . . . . 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))))))
67 seq1 13381 . . . . . . . . . . . . . 14 (1 ∈ ℤ → (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘1))
6844, 67ax-mp 5 . . . . . . . . . . . . 13 (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘1)
69 1nn 11640 . . . . . . . . . . . . . 14 1 ∈ ℕ
70 oveq2 7147 . . . . . . . . . . . . . . . . . . . . . 22 (𝑘 = 1 → (1..^𝑘) = (1..^1))
71 fzo0 13060 . . . . . . . . . . . . . . . . . . . . . 22 (1..^1) = ∅
7270, 71eqtrdi 2852 . . . . . . . . . . . . . . . . . . . . 21 (𝑘 = 1 → (1..^𝑘) = ∅)
7372iuneq1d 4911 . . . . . . . . . . . . . . . . . . . 20 (𝑘 = 1 → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) = 𝑚 ∈ ∅ (𝐹𝑚))
74 0iun 4952 . . . . . . . . . . . . . . . . . . . 20 𝑚 ∈ ∅ (𝐹𝑚) = ∅
7573, 74eqtrdi 2852 . . . . . . . . . . . . . . . . . . 19 (𝑘 = 1 → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) = ∅)
7675difeq2d 4053 . . . . . . . . . . . . . . . . . 18 (𝑘 = 1 → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = ((𝐹𝑘) ∖ ∅))
77 dif0 4289 . . . . . . . . . . . . . . . . . 18 ((𝐹𝑘) ∖ ∅) = (𝐹𝑘)
7876, 77eqtrdi 2852 . . . . . . . . . . . . . . . . 17 (𝑘 = 1 → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = (𝐹𝑘))
79 fveq2 6649 . . . . . . . . . . . . . . . . 17 (𝑘 = 1 → (𝐹𝑘) = (𝐹‘1))
8078, 79eqtrd 2836 . . . . . . . . . . . . . . . 16 (𝑘 = 1 → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = (𝐹‘1))
8180fveq2d 6653 . . . . . . . . . . . . . . 15 (𝑘 = 1 → (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = (vol‘(𝐹‘1)))
82 fvex 6662 . . . . . . . . . . . . . . 15 (vol‘(𝐹‘1)) ∈ V
8381, 34, 82fvmpt 6749 . . . . . . . . . . . . . 14 (1 ∈ ℕ → ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘1) = (vol‘(𝐹‘1)))
8469, 83ax-mp 5 . . . . . . . . . . . . 13 ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘1) = (vol‘(𝐹‘1))
8568, 84eqtri 2824 . . . . . . . . . . . 12 (seq1( + , (𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)))))‘1) = (vol‘(𝐹‘1))
8685a1i 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)))
87 oveq1 7146 . . . . . . . . . . . . . 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))))
88 seqp1 13383 . . . . . . . . . . . . . . . . 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))))
8988, 6eleq2s 2911 . . . . . . . . . . . . . . . 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))))
9089adantl 485 . . . . . . . . . . . . . . 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))))
91 undif2 4386 . . . . . . . . . . . . . . . . . 18 ((𝐹𝑗) ∪ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = ((𝐹𝑗) ∪ (𝐹‘(𝑗 + 1)))
92 fveq2 6649 . . . . . . . . . . . . . . . . . . . . 21 (𝑛 = 𝑗 → (𝐹𝑛) = (𝐹𝑗))
93 fvoveq1 7162 . . . . . . . . . . . . . . . . . . . . 21 (𝑛 = 𝑗 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑗 + 1)))
9492, 93sseq12d 3951 . . . . . . . . . . . . . . . . . . . 20 (𝑛 = 𝑗 → ((𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1)) ↔ (𝐹𝑗) ⊆ (𝐹‘(𝑗 + 1))))
95 simpllr 775 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1)))
96 simpr 488 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℕ)
9794, 95, 96rspcdva 3576 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹𝑗) ⊆ (𝐹‘(𝑗 + 1)))
98 ssequn1 4110 . . . . . . . . . . . . . . . . . . 19 ((𝐹𝑗) ⊆ (𝐹‘(𝑗 + 1)) ↔ ((𝐹𝑗) ∪ (𝐹‘(𝑗 + 1))) = (𝐹‘(𝑗 + 1)))
9997, 98sylib 221 . . . . . . . . . . . . . . . . . 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)))
10091, 99syl5req 2849 . . . . . . . . . . . . . . . . 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))))
101100fveq2d 6653 . . . . . . . . . . . . . . . 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)))))
102 simplll 774 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝐹:ℕ⟶dom vol)
103102, 96ffvelrnd 6833 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹𝑗) ∈ dom vol)
104 peano2nn 11641 . . . . . . . . . . . . . . . . . . . 20 (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℕ)
105104adantl 485 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝑗 + 1) ∈ ℕ)
106102, 105ffvelrnd 6833 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹‘(𝑗 + 1)) ∈ dom vol)
107 difmbl 24151 . . . . . . . . . . . . . . . . . 18 (((𝐹‘(𝑗 + 1)) ∈ dom vol ∧ (𝐹𝑗) ∈ dom vol) → ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ∈ dom vol)
108106, 103, 107syl2anc 587 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ∈ dom vol)
109 disjdif 4382 . . . . . . . . . . . . . . . . . 18 ((𝐹𝑗) ∩ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = ∅
110109a1i 11 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((𝐹𝑗) ∩ ((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = ∅)
111 2fveq3 6654 . . . . . . . . . . . . . . . . . . 19 (𝑘 = 𝑗 → (vol‘(𝐹𝑘)) = (vol‘(𝐹𝑗)))
112111eleq1d 2877 . . . . . . . . . . . . . . . . . 18 (𝑘 = 𝑗 → ((vol‘(𝐹𝑘)) ∈ ℝ ↔ (vol‘(𝐹𝑗)) ∈ ℝ))
113 simplr 768 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ)
114112, 113, 96rspcdva 3576 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘(𝐹𝑗)) ∈ ℝ)
115 mblvol 24138 . . . . . . . . . . . . . . . . . . 19 (((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ∈ dom vol → (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) = (vol*‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))))
116108, 115syl 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))))
117 difssd 4063 . . . . . . . . . . . . . . . . . . 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)))
118 mblss 24139 . . . . . . . . . . . . . . . . . . . 20 ((𝐹‘(𝑗 + 1)) ∈ dom vol → (𝐹‘(𝑗 + 1)) ⊆ ℝ)
119106, 118syl 17 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹‘(𝑗 + 1)) ⊆ ℝ)
120 mblvol 24138 . . . . . . . . . . . . . . . . . . . . 21 ((𝐹‘(𝑗 + 1)) ∈ dom vol → (vol‘(𝐹‘(𝑗 + 1))) = (vol*‘(𝐹‘(𝑗 + 1))))
121106, 120syl 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))))
122 2fveq3 6654 . . . . . . . . . . . . . . . . . . . . . 22 (𝑘 = (𝑗 + 1) → (vol‘(𝐹𝑘)) = (vol‘(𝐹‘(𝑗 + 1))))
123122eleq1d 2877 . . . . . . . . . . . . . . . . . . . . 21 (𝑘 = (𝑗 + 1) → ((vol‘(𝐹𝑘)) ∈ ℝ ↔ (vol‘(𝐹‘(𝑗 + 1))) ∈ ℝ))
124123, 113, 105rspcdva 3576 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘(𝐹‘(𝑗 + 1))) ∈ ℝ)
125121, 124eqeltrrd 2894 . . . . . . . . . . . . . . . . . . 19 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol*‘(𝐹‘(𝑗 + 1))) ∈ ℝ)
126 ovolsscl 24094 . . . . . . . . . . . . . . . . . . 19 ((((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗)) ⊆ (𝐹‘(𝑗 + 1)) ∧ (𝐹‘(𝑗 + 1)) ⊆ ℝ ∧ (vol*‘(𝐹‘(𝑗 + 1))) ∈ ℝ) → (vol*‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) ∈ ℝ)
127117, 119, 125, 126syl3anc 1368 . . . . . . . . . . . . . . . . . 18 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol*‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) ∈ ℝ)
128116, 127eqeltrd 2893 . . . . . . . . . . . . . . . . 17 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (vol‘((𝐹‘(𝑗 + 1)) ∖ (𝐹𝑗))) ∈ ℝ)
129 volun 24153 . . . . . . . . . . . . . . . . 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)))))
130103, 108, 110, 114, 128, 129syl32anc 1375 . . . . . . . . . . . . . . . 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)))))
13195adantr 484 . . . . . . . . . . . . . . . . . . . . . . . . 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)))
132 elfznn 12935 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝑚 ∈ (1...𝑗) → 𝑚 ∈ ℕ)
133132adantl 485 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) ∧ 𝑚 ∈ (1...𝑗)) → 𝑚 ∈ ℕ)
134 elfzuz3 12903 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝑚 ∈ (1...𝑗) → 𝑗 ∈ (ℤ𝑚))
135134adantl 485 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) ∧ 𝑚 ∈ (1...𝑗)) → 𝑗 ∈ (ℤ𝑚))
136 volsuplem 24163 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1)) ∧ (𝑚 ∈ ℕ ∧ 𝑗 ∈ (ℤ𝑚))) → (𝐹𝑚) ⊆ (𝐹𝑗))
137131, 133, 135, 136syl12anc 835 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) ∧ 𝑚 ∈ (1...𝑗)) → (𝐹𝑚) ⊆ (𝐹𝑗))
138137ralrimiva 3152 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ∀𝑚 ∈ (1...𝑗)(𝐹𝑚) ⊆ (𝐹𝑗))
139 iunss 4935 . . . . . . . . . . . . . . . . . . . . . . 23 ( 𝑚 ∈ (1...𝑗)(𝐹𝑚) ⊆ (𝐹𝑗) ↔ ∀𝑚 ∈ (1...𝑗)(𝐹𝑚) ⊆ (𝐹𝑗))
140138, 139sylibr 237 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑚 ∈ (1...𝑗)(𝐹𝑚) ⊆ (𝐹𝑗))
14196, 6eleqtrdi 2903 . . . . . . . . . . . . . . . . . . . . . . . 24 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ (ℤ‘1))
142 eluzfz2 12914 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑗 ∈ (ℤ‘1) → 𝑗 ∈ (1...𝑗))
143141, 142syl 17 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ (1...𝑗))
144 fveq2 6649 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑚 = 𝑗 → (𝐹𝑚) = (𝐹𝑗))
145144ssiun2s 4938 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑗 ∈ (1...𝑗) → (𝐹𝑗) ⊆ 𝑚 ∈ (1...𝑗)(𝐹𝑚))
146143, 145syl 17 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹𝑗) ⊆ 𝑚 ∈ (1...𝑗)(𝐹𝑚))
147140, 146eqssd 3935 . . . . . . . . . . . . . . . . . . . . 21 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑚 ∈ (1...𝑗)(𝐹𝑚) = (𝐹𝑗))
14896nnzd 12078 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → 𝑗 ∈ ℤ)
149 fzval3 13105 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑗 ∈ ℤ → (1...𝑗) = (1..^(𝑗 + 1)))
150148, 149syl 17 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (1...𝑗) = (1..^(𝑗 + 1)))
151150iuneq1d 4911 . . . . . . . . . . . . . . . . . . . . 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))
152147, 151eqtr3d 2838 . . . . . . . . . . . . . . . . . . . 20 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → (𝐹𝑗) = 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))
153152difeq2d 4053 . . . . . . . . . . . . . . . . . . 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)))
154153fveq2d 6653 . . . . . . . . . . . . . . . . . 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))))
155 fveq2 6649 . . . . . . . . . . . . . . . . . . . . . 22 (𝑘 = (𝑗 + 1) → (𝐹𝑘) = (𝐹‘(𝑗 + 1)))
156 oveq2 7147 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑘 = (𝑗 + 1) → (1..^𝑘) = (1..^(𝑗 + 1)))
157156iuneq1d 4911 . . . . . . . . . . . . . . . . . . . . . 22 (𝑘 = (𝑗 + 1) → 𝑚 ∈ (1..^𝑘)(𝐹𝑚) = 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))
158155, 157difeq12d 4054 . . . . . . . . . . . . . . . . . . . . 21 (𝑘 = (𝑗 + 1) → ((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚)) = ((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚)))
159158fveq2d 6653 . . . . . . . . . . . . . . . . . . . 20 (𝑘 = (𝑗 + 1) → (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))) = (vol‘((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))))
160 fvex 6662 . . . . . . . . . . . . . . . . . . . 20 (vol‘((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))) ∈ V
161159, 34, 160fvmpt 6749 . . . . . . . . . . . . . . . . . . 19 ((𝑗 + 1) ∈ ℕ → ((𝑘 ∈ ℕ ↦ (vol‘((𝐹𝑘) ∖ 𝑚 ∈ (1..^𝑘)(𝐹𝑚))))‘(𝑗 + 1)) = (vol‘((𝐹‘(𝑗 + 1)) ∖ 𝑚 ∈ (1..^(𝑗 + 1))(𝐹𝑚))))
162105, 161syl 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))))
163154, 162eqtr4d 2839 . . . . . . . . . . . . . . . . 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)))
164163oveq2d 7155 . . . . . . . . . . . . . . . 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))))
165101, 130, 1643eqtrd 2840 . . . . . . . . . . . . . . 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))))
16690, 165eqeq12d 2817 . . . . . . . . . . . . . 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)))))
16787, 166syl5ibr 249 . . . . . . . . . . . . 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)))))
168167expcom 417 . . . . . . . . . . . 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))))))
169168a2d 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))))))
17058, 62, 66, 62, 86, 169nnind 11647 . . . . . . . . . 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))))
171170impcom 411 . . . . . . . . 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)))
172 fvco3 6741 . . . . . . . . . 10 ((𝐹:ℕ⟶dom vol ∧ 𝑗 ∈ ℕ) → ((vol ∘ 𝐹)‘𝑗) = (vol‘(𝐹𝑗)))
17351, 172sylan 583 . . . . . . . . 9 ((((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) ∧ 𝑗 ∈ ℕ) → ((vol ∘ 𝐹)‘𝑗) = (vol‘(𝐹𝑗)))
174171, 173eqtr4d 2839 . . . . . . . 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))
17549, 54, 174eqfnfvd 6786 . . . . . . 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))
176175rneqd 5776 . . . . . 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))
177 rnco2 6077 . . . . . 6 ran (vol ∘ 𝐹) = (vol “ ran 𝐹)
178176, 177eqtrdi 2852 . . . . 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))
179178supeq1d 8898 . . . 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*, < ))
18036, 43, 1793eqtr3d 2844 . . 3 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ) → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < ))
181180ex 416 . 2 ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < )))
182 rexnal 3204 . . 3 (∃𝑘 ∈ ℕ ¬ (vol‘(𝐹𝑘)) ∈ ℝ ↔ ¬ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ)
183 fniunfv 6988 . . . . . . . . . . . 12 (𝐹 Fn ℕ → 𝑛 ∈ ℕ (𝐹𝑛) = ran 𝐹)
18438, 183syl 17 . . . . . . . . . . 11 (𝐹:ℕ⟶dom vol → 𝑛 ∈ ℕ (𝐹𝑛) = ran 𝐹)
185 ffvelrn 6830 . . . . . . . . . . . . 13 ((𝐹:ℕ⟶dom vol ∧ 𝑛 ∈ ℕ) → (𝐹𝑛) ∈ dom vol)
186185ralrimiva 3152 . . . . . . . . . . . 12 (𝐹:ℕ⟶dom vol → ∀𝑛 ∈ ℕ (𝐹𝑛) ∈ dom vol)
187 iunmbl 24161 . . . . . . . . . . . 12 (∀𝑛 ∈ ℕ (𝐹𝑛) ∈ dom vol → 𝑛 ∈ ℕ (𝐹𝑛) ∈ dom vol)
188186, 187syl 17 . . . . . . . . . . 11 (𝐹:ℕ⟶dom vol → 𝑛 ∈ ℕ (𝐹𝑛) ∈ dom vol)
189184, 188eqeltrrd 2894 . . . . . . . . . 10 (𝐹:ℕ⟶dom vol → ran 𝐹 ∈ dom vol)
190189ad2antrr 725 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ran 𝐹 ∈ dom vol)
191 mblss 24139 . . . . . . . . 9 ( ran 𝐹 ∈ dom vol → ran 𝐹 ⊆ ℝ)
192190, 191syl 17 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ran 𝐹 ⊆ ℝ)
193 ovolcl 24086 . . . . . . . 8 ( ran 𝐹 ⊆ ℝ → (vol*‘ ran 𝐹) ∈ ℝ*)
194192, 193syl 17 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘ ran 𝐹) ∈ ℝ*)
195 pnfge 12517 . . . . . . 7 ((vol*‘ ran 𝐹) ∈ ℝ* → (vol*‘ ran 𝐹) ≤ +∞)
196194, 195syl 17 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘ ran 𝐹) ≤ +∞)
197 simprr 772 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ¬ (vol‘(𝐹𝑘)) ∈ ℝ)
1981ad2ant2r 746 . . . . . . . . . . . . 13 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ∈ dom vol)
199198, 18syl 17 . . . . . . . . . . . 12 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ⊆ ℝ)
200 ovolcl 24086 . . . . . . . . . . . 12 ((𝐹𝑘) ⊆ ℝ → (vol*‘(𝐹𝑘)) ∈ ℝ*)
201199, 200syl 17 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘(𝐹𝑘)) ∈ ℝ*)
202 xrrebnd 12553 . . . . . . . . . . 11 ((vol*‘(𝐹𝑘)) ∈ ℝ* → ((vol*‘(𝐹𝑘)) ∈ ℝ ↔ (-∞ < (vol*‘(𝐹𝑘)) ∧ (vol*‘(𝐹𝑘)) < +∞)))
203201, 202syl 17 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol*‘(𝐹𝑘)) ∈ ℝ ↔ (-∞ < (vol*‘(𝐹𝑘)) ∧ (vol*‘(𝐹𝑘)) < +∞)))
204198, 20syl 17 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) = (vol*‘(𝐹𝑘)))
205204eleq1d 2877 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol‘(𝐹𝑘)) ∈ ℝ ↔ (vol*‘(𝐹𝑘)) ∈ ℝ))
206 ovolge0 24089 . . . . . . . . . . . . 13 ((𝐹𝑘) ⊆ ℝ → 0 ≤ (vol*‘(𝐹𝑘)))
207 mnflt0 12512 . . . . . . . . . . . . . 14 -∞ < 0
208 mnfxr 10691 . . . . . . . . . . . . . . 15 -∞ ∈ ℝ*
209 0xr 10681 . . . . . . . . . . . . . . 15 0 ∈ ℝ*
210 xrltletr 12542 . . . . . . . . . . . . . . 15 ((-∞ ∈ ℝ* ∧ 0 ∈ ℝ* ∧ (vol*‘(𝐹𝑘)) ∈ ℝ*) → ((-∞ < 0 ∧ 0 ≤ (vol*‘(𝐹𝑘))) → -∞ < (vol*‘(𝐹𝑘))))
211208, 209, 210mp3an12 1448 . . . . . . . . . . . . . 14 ((vol*‘(𝐹𝑘)) ∈ ℝ* → ((-∞ < 0 ∧ 0 ≤ (vol*‘(𝐹𝑘))) → -∞ < (vol*‘(𝐹𝑘))))
212207, 211mpani 695 . . . . . . . . . . . . 13 ((vol*‘(𝐹𝑘)) ∈ ℝ* → (0 ≤ (vol*‘(𝐹𝑘)) → -∞ < (vol*‘(𝐹𝑘))))
213200, 206, 212sylc 65 . . . . . . . . . . . 12 ((𝐹𝑘) ⊆ ℝ → -∞ < (vol*‘(𝐹𝑘)))
214199, 213syl 17 . . . . . . . . . . 11 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → -∞ < (vol*‘(𝐹𝑘)))
215214biantrurd 536 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol*‘(𝐹𝑘)) < +∞ ↔ (-∞ < (vol*‘(𝐹𝑘)) ∧ (vol*‘(𝐹𝑘)) < +∞)))
216203, 205, 2153bitr4d 314 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol‘(𝐹𝑘)) ∈ ℝ ↔ (vol*‘(𝐹𝑘)) < +∞))
217197, 216mtbid 327 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ¬ (vol*‘(𝐹𝑘)) < +∞)
218 nltpnft 12549 . . . . . . . . 9 ((vol*‘(𝐹𝑘)) ∈ ℝ* → ((vol*‘(𝐹𝑘)) = +∞ ↔ ¬ (vol*‘(𝐹𝑘)) < +∞))
219201, 218syl 17 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → ((vol*‘(𝐹𝑘)) = +∞ ↔ ¬ (vol*‘(𝐹𝑘)) < +∞))
220217, 219mpbird 260 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘(𝐹𝑘)) = +∞)
22138ad2antrr 725 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝐹 Fn ℕ)
222 simprl 770 . . . . . . . . . 10 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝑘 ∈ ℕ)
223 fnfvelrn 6829 . . . . . . . . . 10 ((𝐹 Fn ℕ ∧ 𝑘 ∈ ℕ) → (𝐹𝑘) ∈ ran 𝐹)
224221, 222, 223syl2anc 587 . . . . . . . . 9 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ∈ ran 𝐹)
225 elssuni 4833 . . . . . . . . 9 ((𝐹𝑘) ∈ ran 𝐹 → (𝐹𝑘) ⊆ ran 𝐹)
226224, 225syl 17 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (𝐹𝑘) ⊆ ran 𝐹)
227 ovolss 24093 . . . . . . . 8 (((𝐹𝑘) ⊆ ran 𝐹 ran 𝐹 ⊆ ℝ) → (vol*‘(𝐹𝑘)) ≤ (vol*‘ ran 𝐹))
228226, 192, 227syl2anc 587 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘(𝐹𝑘)) ≤ (vol*‘ ran 𝐹))
229220, 228eqbrtrrd 5057 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → +∞ ≤ (vol*‘ ran 𝐹))
230 pnfxr 10688 . . . . . . 7 +∞ ∈ ℝ*
231 xrletri3 12539 . . . . . . 7 (((vol*‘ ran 𝐹) ∈ ℝ* ∧ +∞ ∈ ℝ*) → ((vol*‘ ran 𝐹) = +∞ ↔ ((vol*‘ ran 𝐹) ≤ +∞ ∧ +∞ ≤ (vol*‘ ran 𝐹))))
232194, 230, 231sylancl 589 . . . . . 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))))
233196, 229, 232mpbir2and 712 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol*‘ ran 𝐹) = +∞)
234 mblvol 24138 . . . . . 6 ( ran 𝐹 ∈ dom vol → (vol‘ ran 𝐹) = (vol*‘ ran 𝐹))
235190, 234syl 17 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘ ran 𝐹) = (vol*‘ ran 𝐹))
236 imassrn 5911 . . . . . . 7 (vol “ ran 𝐹) ⊆ ran vol
237 frn 6497 . . . . . . . . 9 (vol:dom vol⟶(0[,]+∞) → ran vol ⊆ (0[,]+∞))
23850, 237ax-mp 5 . . . . . . . 8 ran vol ⊆ (0[,]+∞)
239 iccssxr 12812 . . . . . . . 8 (0[,]+∞) ⊆ ℝ*
240238, 239sstri 3927 . . . . . . 7 ran vol ⊆ ℝ*
241236, 240sstri 3927 . . . . . 6 (vol “ ran 𝐹) ⊆ ℝ*
242204, 220eqtrd 2836 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) = +∞)
243 simpll 766 . . . . . . . 8 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → 𝐹:ℕ⟶dom vol)
244 ffun 6494 . . . . . . . . . 10 (vol:dom vol⟶(0[,]+∞) → Fun vol)
24550, 244ax-mp 5 . . . . . . . . 9 Fun vol
246 frn 6497 . . . . . . . . 9 (𝐹:ℕ⟶dom vol → ran 𝐹 ⊆ dom vol)
247 funfvima2 6975 . . . . . . . . 9 ((Fun vol ∧ ran 𝐹 ⊆ dom vol) → ((𝐹𝑘) ∈ ran 𝐹 → (vol‘(𝐹𝑘)) ∈ (vol “ ran 𝐹)))
248245, 246, 247sylancr 590 . . . . . . . 8 (𝐹:ℕ⟶dom vol → ((𝐹𝑘) ∈ ran 𝐹 → (vol‘(𝐹𝑘)) ∈ (vol “ ran 𝐹)))
249243, 224, 248sylc 65 . . . . . . 7 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘(𝐹𝑘)) ∈ (vol “ ran 𝐹))
250242, 249eqeltrrd 2894 . . . . . 6 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → +∞ ∈ (vol “ ran 𝐹))
251 supxrpnf 12703 . . . . . 6 (((vol “ ran 𝐹) ⊆ ℝ* ∧ +∞ ∈ (vol “ ran 𝐹)) → sup((vol “ ran 𝐹), ℝ*, < ) = +∞)
252241, 250, 251sylancr 590 . . . . 5 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → sup((vol “ ran 𝐹), ℝ*, < ) = +∞)
253233, 235, 2523eqtr4d 2846 . . . 4 (((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) ∧ (𝑘 ∈ ℕ ∧ ¬ (vol‘(𝐹𝑘)) ∈ ℝ)) → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < ))
254253rexlimdvaa 3247 . . 3 ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (∃𝑘 ∈ ℕ ¬ (vol‘(𝐹𝑘)) ∈ ℝ → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < )))
255182, 254syl5bir 246 . 2 ((𝐹:ℕ⟶dom vol ∧ ∀𝑛 ∈ ℕ (𝐹𝑛) ⊆ (𝐹‘(𝑛 + 1))) → (¬ ∀𝑘 ∈ ℕ (vol‘(𝐹𝑘)) ∈ ℝ → (vol‘ ran 𝐹) = sup((vol “ ran 𝐹), ℝ*, < )))
256181, 255pm2.61d 182 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 209   ∧ wa 399   = wceq 1538   ∈ wcel 2112  ∀wral 3109  ∃wrex 3110   ∖ cdif 3881   ∪ cun 3882   ∩ cin 3883   ⊆ wss 3884  ∅c0 4246  ∪ cuni 4803  ∪ ciun 4884  Disj wdisj 4998   class class class wbr 5033   ↦ cmpt 5113  dom cdm 5523  ran crn 5524   “ cima 5526   ∘ ccom 5527  Fun wfun 6322   Fn wfn 6323  ⟶wf 6324  ‘cfv 6328  (class class class)co 7139  Fincfn 8496  supcsup 8892  ℝcr 10529  0cc0 10530  1c1 10531   + caddc 10533  +∞cpnf 10665  -∞cmnf 10666  ℝ*cxr 10667   < clt 10668   ≤ cle 10669  ℕcn 11629  ℤcz 11973  ℤ≥cuz 12235  [,]cicc 12733  ...cfz 12889  ..^cfzo 13032  seqcseq 13368  vol*covol 24070  volcvol 24071 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2773  ax-rep 5157  ax-sep 5170  ax-nul 5177  ax-pow 5234  ax-pr 5298  ax-un 7445  ax-inf2 9092  ax-cc 9850  ax-cnex 10586  ax-resscn 10587  ax-1cn 10588  ax-icn 10589  ax-addcl 10590  ax-addrcl 10591  ax-mulcl 10592  ax-mulrcl 10593  ax-mulcom 10594  ax-addass 10595  ax-mulass 10596  ax-distr 10597  ax-i2m1 10598  ax-1ne0 10599  ax-1rid 10600  ax-rnegex 10601  ax-rrecex 10602  ax-cnre 10603  ax-pre-lttri 10604  ax-pre-lttrn 10605  ax-pre-ltadd 10606  ax-pre-mulgt0 10607  ax-pre-sup 10608 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2601  df-eu 2632  df-clab 2780  df-cleq 2794  df-clel 2873  df-nfc 2941  df-ne 2991  df-nel 3095  df-ral 3114  df-rex 3115  df-reu 3116  df-rmo 3117  df-rab 3118  df-v 3446  df-sbc 3724  df-csb 3832  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-pss 3903  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-tp 4533  df-op 4535  df-uni 4804  df-int 4842  df-iun 4886  df-disj 4999  df-br 5034  df-opab 5096  df-mpt 5114  df-tr 5140  df-id 5428  df-eprel 5433  df-po 5442  df-so 5443  df-fr 5482  df-se 5483  df-we 5484  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-pred 6120  df-ord 6166  df-on 6167  df-lim 6168  df-suc 6169  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-isom 6337  df-riota 7097  df-ov 7142  df-oprab 7143  df-mpo 7144  df-of 7393  df-om 7565  df-1st 7675  df-2nd 7676  df-wrecs 7934  df-recs 7995  df-rdg 8033  df-1o 8089  df-2o 8090  df-oadd 8093  df-er 8276  df-map 8395  df-pm 8396  df-en 8497  df-dom 8498  df-sdom 8499  df-fin 8500  df-sup 8894  df-inf 8895  df-oi 8962  df-dju 9318  df-card 9356  df-pnf 10670  df-mnf 10671  df-xr 10672  df-ltxr 10673  df-le 10674  df-sub 10865  df-neg 10866  df-div 11291  df-nn 11630  df-2 11692  df-3 11693  df-n0 11890  df-z 11974  df-uz 12236  df-q 12341  df-rp 12382  df-xadd 12500  df-ioo 12734  df-ico 12736  df-icc 12737  df-fz 12890  df-fzo 13033  df-fl 13161  df-seq 13369  df-exp 13430  df-hash 13691  df-cj 14454  df-re 14455  df-im 14456  df-sqrt 14590  df-abs 14591  df-clim 14841  df-rlim 14842  df-sum 15039  df-xmet 20088  df-met 20089  df-ovol 24072  df-vol 24073 This theorem is referenced by:  volsup2  24213  itg1climres  24322  itg2gt0  24368
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