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Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  ovolval4lem1 Structured version   Visualization version   GIF version

Theorem ovolval4lem1 44187
Description: |- ( ( ph /\ n e. A ) -> ( ( (,) o. G ) 𝑛) = (((,) ∘ 𝐹) n ) ) (Contributed by Glauco Siliprandi, 3-Mar-2021.)
Hypotheses
Ref Expression
ovolval4lem1.f (𝜑𝐹:ℕ⟶(ℝ* × ℝ*))
ovolval4lem1.g 𝐺 = (𝑛 ∈ ℕ ↦ ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩)
ovolval4lem1.a 𝐴 = {𝑛 ∈ ℕ ∣ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))}
Assertion
Ref Expression
ovolval4lem1 (𝜑 → ( ran ((,) ∘ 𝐹) = ran ((,) ∘ 𝐺) ∧ (vol ∘ ((,) ∘ 𝐹)) = (vol ∘ ((,) ∘ 𝐺))))
Distinct variable groups:   𝐴,𝑛   𝑛,𝐹   𝑛,𝐺   𝜑,𝑛

Proof of Theorem ovolval4lem1
StepHypRef Expression
1 ioof 13179 . . . . . . . 8 (,):(ℝ* × ℝ*)⟶𝒫 ℝ
21a1i 11 . . . . . . 7 (𝜑 → (,):(ℝ* × ℝ*)⟶𝒫 ℝ)
3 ovolval4lem1.f . . . . . . 7 (𝜑𝐹:ℕ⟶(ℝ* × ℝ*))
4 fco 6624 . . . . . . 7 (((,):(ℝ* × ℝ*)⟶𝒫 ℝ ∧ 𝐹:ℕ⟶(ℝ* × ℝ*)) → ((,) ∘ 𝐹):ℕ⟶𝒫 ℝ)
52, 3, 4syl2anc 584 . . . . . 6 (𝜑 → ((,) ∘ 𝐹):ℕ⟶𝒫 ℝ)
65ffnd 6601 . . . . 5 (𝜑 → ((,) ∘ 𝐹) Fn ℕ)
7 fniunfv 7120 . . . . 5 (((,) ∘ 𝐹) Fn ℕ → 𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛) = ran ((,) ∘ 𝐹))
86, 7syl 17 . . . 4 (𝜑 𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛) = ran ((,) ∘ 𝐹))
98eqcomd 2744 . . 3 (𝜑 ran ((,) ∘ 𝐹) = 𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛))
10 ovolval4lem1.a . . . . . . . . 9 𝐴 = {𝑛 ∈ ℕ ∣ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))}
11 ssrab2 4013 . . . . . . . . 9 {𝑛 ∈ ℕ ∣ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))} ⊆ ℕ
1210, 11eqsstri 3955 . . . . . . . 8 𝐴 ⊆ ℕ
13 undif 4415 . . . . . . . 8 (𝐴 ⊆ ℕ ↔ (𝐴 ∪ (ℕ ∖ 𝐴)) = ℕ)
1412, 13mpbi 229 . . . . . . 7 (𝐴 ∪ (ℕ ∖ 𝐴)) = ℕ
1514eqcomi 2747 . . . . . 6 ℕ = (𝐴 ∪ (ℕ ∖ 𝐴))
1615iuneq1i 42635 . . . . 5 𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛) = 𝑛 ∈ (𝐴 ∪ (ℕ ∖ 𝐴))(((,) ∘ 𝐹)‘𝑛)
17 iunxun 5023 . . . . 5 𝑛 ∈ (𝐴 ∪ (ℕ ∖ 𝐴))(((,) ∘ 𝐹)‘𝑛) = ( 𝑛𝐴 (((,) ∘ 𝐹)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐹)‘𝑛))
1816, 17eqtri 2766 . . . 4 𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛) = ( 𝑛𝐴 (((,) ∘ 𝐹)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐹)‘𝑛))
1918a1i 11 . . 3 (𝜑 𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛) = ( 𝑛𝐴 (((,) ∘ 𝐹)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐹)‘𝑛)))
203ffvelrnda 6961 . . . . . . . . . . 11 ((𝜑𝑛 ∈ ℕ) → (𝐹𝑛) ∈ (ℝ* × ℝ*))
21 xp1st 7863 . . . . . . . . . . 11 ((𝐹𝑛) ∈ (ℝ* × ℝ*) → (1st ‘(𝐹𝑛)) ∈ ℝ*)
2220, 21syl 17 . . . . . . . . . 10 ((𝜑𝑛 ∈ ℕ) → (1st ‘(𝐹𝑛)) ∈ ℝ*)
23 xp2nd 7864 . . . . . . . . . . . 12 ((𝐹𝑛) ∈ (ℝ* × ℝ*) → (2nd ‘(𝐹𝑛)) ∈ ℝ*)
2420, 23syl 17 . . . . . . . . . . 11 ((𝜑𝑛 ∈ ℕ) → (2nd ‘(𝐹𝑛)) ∈ ℝ*)
2524, 22ifcld 4505 . . . . . . . . . 10 ((𝜑𝑛 ∈ ℕ) → if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))) ∈ ℝ*)
2622, 25opelxpd 5627 . . . . . . . . 9 ((𝜑𝑛 ∈ ℕ) → ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩ ∈ (ℝ* × ℝ*))
27 ovolval4lem1.g . . . . . . . . 9 𝐺 = (𝑛 ∈ ℕ ↦ ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩)
2826, 27fmptd 6988 . . . . . . . 8 (𝜑𝐺:ℕ⟶(ℝ* × ℝ*))
29 fco 6624 . . . . . . . 8 (((,):(ℝ* × ℝ*)⟶𝒫 ℝ ∧ 𝐺:ℕ⟶(ℝ* × ℝ*)) → ((,) ∘ 𝐺):ℕ⟶𝒫 ℝ)
302, 28, 29syl2anc 584 . . . . . . 7 (𝜑 → ((,) ∘ 𝐺):ℕ⟶𝒫 ℝ)
3130ffnd 6601 . . . . . 6 (𝜑 → ((,) ∘ 𝐺) Fn ℕ)
32 fniunfv 7120 . . . . . 6 (((,) ∘ 𝐺) Fn ℕ → 𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛) = ran ((,) ∘ 𝐺))
3331, 32syl 17 . . . . 5 (𝜑 𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛) = ran ((,) ∘ 𝐺))
3433eqcomd 2744 . . . 4 (𝜑 ran ((,) ∘ 𝐺) = 𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛))
3515iuneq1i 42635 . . . . . 6 𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛) = 𝑛 ∈ (𝐴 ∪ (ℕ ∖ 𝐴))(((,) ∘ 𝐺)‘𝑛)
36 iunxun 5023 . . . . . 6 𝑛 ∈ (𝐴 ∪ (ℕ ∖ 𝐴))(((,) ∘ 𝐺)‘𝑛) = ( 𝑛𝐴 (((,) ∘ 𝐺)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐺)‘𝑛))
3735, 36eqtri 2766 . . . . 5 𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛) = ( 𝑛𝐴 (((,) ∘ 𝐺)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐺)‘𝑛))
3837a1i 11 . . . 4 (𝜑 𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛) = ( 𝑛𝐴 (((,) ∘ 𝐺)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐺)‘𝑛)))
3928adantr 481 . . . . . . . 8 ((𝜑𝑛𝐴) → 𝐺:ℕ⟶(ℝ* × ℝ*))
4012sseli 3917 . . . . . . . . 9 (𝑛𝐴𝑛 ∈ ℕ)
4140adantl 482 . . . . . . . 8 ((𝜑𝑛𝐴) → 𝑛 ∈ ℕ)
42 fvco3 6867 . . . . . . . 8 ((𝐺:ℕ⟶(ℝ* × ℝ*) ∧ 𝑛 ∈ ℕ) → (((,) ∘ 𝐺)‘𝑛) = ((,)‘(𝐺𝑛)))
4339, 41, 42syl2anc 584 . . . . . . 7 ((𝜑𝑛𝐴) → (((,) ∘ 𝐺)‘𝑛) = ((,)‘(𝐺𝑛)))
443adantr 481 . . . . . . . . 9 ((𝜑𝑛𝐴) → 𝐹:ℕ⟶(ℝ* × ℝ*))
45 fvco3 6867 . . . . . . . . 9 ((𝐹:ℕ⟶(ℝ* × ℝ*) ∧ 𝑛 ∈ ℕ) → (((,) ∘ 𝐹)‘𝑛) = ((,)‘(𝐹𝑛)))
4644, 41, 45syl2anc 584 . . . . . . . 8 ((𝜑𝑛𝐴) → (((,) ∘ 𝐹)‘𝑛) = ((,)‘(𝐹𝑛)))
47 simpl 483 . . . . . . . . . . 11 ((𝜑𝑛𝐴) → 𝜑)
48 1st2nd2 7870 . . . . . . . . . . . 12 ((𝐹𝑛) ∈ (ℝ* × ℝ*) → (𝐹𝑛) = ⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩)
4920, 48syl 17 . . . . . . . . . . 11 ((𝜑𝑛 ∈ ℕ) → (𝐹𝑛) = ⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩)
5047, 41, 49syl2anc 584 . . . . . . . . . 10 ((𝜑𝑛𝐴) → (𝐹𝑛) = ⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩)
5127a1i 11 . . . . . . . . . . . . 13 (𝜑𝐺 = (𝑛 ∈ ℕ ↦ ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩))
5226elexd 3452 . . . . . . . . . . . . 13 ((𝜑𝑛 ∈ ℕ) → ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩ ∈ V)
5351, 52fvmpt2d 6888 . . . . . . . . . . . 12 ((𝜑𝑛 ∈ ℕ) → (𝐺𝑛) = ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩)
5447, 41, 53syl2anc 584 . . . . . . . . . . 11 ((𝜑𝑛𝐴) → (𝐺𝑛) = ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩)
5510eleq2i 2830 . . . . . . . . . . . . . . . . 17 (𝑛𝐴𝑛 ∈ {𝑛 ∈ ℕ ∣ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))})
5655biimpi 215 . . . . . . . . . . . . . . . 16 (𝑛𝐴𝑛 ∈ {𝑛 ∈ ℕ ∣ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))})
57 rabid 3310 . . . . . . . . . . . . . . . 16 (𝑛 ∈ {𝑛 ∈ ℕ ∣ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))} ↔ (𝑛 ∈ ℕ ∧ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))))
5856, 57sylib 217 . . . . . . . . . . . . . . 15 (𝑛𝐴 → (𝑛 ∈ ℕ ∧ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))))
5958simprd 496 . . . . . . . . . . . . . 14 (𝑛𝐴 → (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)))
6059adantl 482 . . . . . . . . . . . . 13 ((𝜑𝑛𝐴) → (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)))
6160iftrued 4467 . . . . . . . . . . . 12 ((𝜑𝑛𝐴) → if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))) = (2nd ‘(𝐹𝑛)))
6261opeq2d 4811 . . . . . . . . . . 11 ((𝜑𝑛𝐴) → ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩ = ⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩)
63 eqidd 2739 . . . . . . . . . . 11 ((𝜑𝑛𝐴) → ⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩ = ⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩)
6454, 62, 633eqtrd 2782 . . . . . . . . . 10 ((𝜑𝑛𝐴) → (𝐺𝑛) = ⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩)
6550, 64eqtr4d 2781 . . . . . . . . 9 ((𝜑𝑛𝐴) → (𝐹𝑛) = (𝐺𝑛))
6665fveq2d 6778 . . . . . . . 8 ((𝜑𝑛𝐴) → ((,)‘(𝐹𝑛)) = ((,)‘(𝐺𝑛)))
6746, 66eqtrd 2778 . . . . . . 7 ((𝜑𝑛𝐴) → (((,) ∘ 𝐹)‘𝑛) = ((,)‘(𝐺𝑛)))
6843, 67eqtr4d 2781 . . . . . 6 ((𝜑𝑛𝐴) → (((,) ∘ 𝐺)‘𝑛) = (((,) ∘ 𝐹)‘𝑛))
6968iuneq2dv 4948 . . . . 5 (𝜑 𝑛𝐴 (((,) ∘ 𝐺)‘𝑛) = 𝑛𝐴 (((,) ∘ 𝐹)‘𝑛))
7028adantr 481 . . . . . . . . . 10 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → 𝐺:ℕ⟶(ℝ* × ℝ*))
71 eldifi 4061 . . . . . . . . . . 11 (𝑛 ∈ (ℕ ∖ 𝐴) → 𝑛 ∈ ℕ)
7271adantl 482 . . . . . . . . . 10 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → 𝑛 ∈ ℕ)
7370, 72, 42syl2anc 584 . . . . . . . . 9 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (((,) ∘ 𝐺)‘𝑛) = ((,)‘(𝐺𝑛)))
74 simpl 483 . . . . . . . . . . . 12 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → 𝜑)
7574, 72, 53syl2anc 584 . . . . . . . . . . 11 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (𝐺𝑛) = ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩)
7671anim1i 615 . . . . . . . . . . . . . . . . 17 ((𝑛 ∈ (ℕ ∖ 𝐴) ∧ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))) → (𝑛 ∈ ℕ ∧ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))))
7776, 57sylibr 233 . . . . . . . . . . . . . . . 16 ((𝑛 ∈ (ℕ ∖ 𝐴) ∧ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))) → 𝑛 ∈ {𝑛 ∈ ℕ ∣ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))})
7877, 55sylibr 233 . . . . . . . . . . . . . . 15 ((𝑛 ∈ (ℕ ∖ 𝐴) ∧ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))) → 𝑛𝐴)
7978adantll 711 . . . . . . . . . . . . . 14 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))) → 𝑛𝐴)
80 eldifn 4062 . . . . . . . . . . . . . . 15 (𝑛 ∈ (ℕ ∖ 𝐴) → ¬ 𝑛𝐴)
8180ad2antlr 724 . . . . . . . . . . . . . 14 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛))) → ¬ 𝑛𝐴)
8279, 81pm2.65da 814 . . . . . . . . . . . . 13 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ¬ (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)))
8382iffalsed 4470 . . . . . . . . . . . 12 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))) = (1st ‘(𝐹𝑛)))
8483opeq2d 4811 . . . . . . . . . . 11 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ⟨(1st ‘(𝐹𝑛)), if((1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛)), (1st ‘(𝐹𝑛)))⟩ = ⟨(1st ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))⟩)
8575, 84eqtrd 2778 . . . . . . . . . 10 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (𝐺𝑛) = ⟨(1st ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))⟩)
8685fveq2d 6778 . . . . . . . . 9 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ((,)‘(𝐺𝑛)) = ((,)‘⟨(1st ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))⟩))
87 iooid 13107 . . . . . . . . . . . 12 ((1st ‘(𝐹𝑛))(,)(1st ‘(𝐹𝑛))) = ∅
8887eqcomi 2747 . . . . . . . . . . 11 ∅ = ((1st ‘(𝐹𝑛))(,)(1st ‘(𝐹𝑛)))
89 df-ov 7278 . . . . . . . . . . 11 ((1st ‘(𝐹𝑛))(,)(1st ‘(𝐹𝑛))) = ((,)‘⟨(1st ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))⟩)
9088, 89eqtr2i 2767 . . . . . . . . . 10 ((,)‘⟨(1st ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))⟩) = ∅
9190a1i 11 . . . . . . . . 9 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ((,)‘⟨(1st ‘(𝐹𝑛)), (1st ‘(𝐹𝑛))⟩) = ∅)
9273, 86, 913eqtrd 2782 . . . . . . . 8 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (((,) ∘ 𝐺)‘𝑛) = ∅)
9392iuneq2dv 4948 . . . . . . 7 (𝜑 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐺)‘𝑛) = 𝑛 ∈ (ℕ ∖ 𝐴)∅)
94 iun0 4991 . . . . . . . 8 𝑛 ∈ (ℕ ∖ 𝐴)∅ = ∅
9594a1i 11 . . . . . . 7 (𝜑 𝑛 ∈ (ℕ ∖ 𝐴)∅ = ∅)
9693, 95eqtrd 2778 . . . . . 6 (𝜑 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐺)‘𝑛) = ∅)
9774, 3syl 17 . . . . . . . . . 10 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → 𝐹:ℕ⟶(ℝ* × ℝ*))
9897, 72, 45syl2anc 584 . . . . . . . . 9 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (((,) ∘ 𝐹)‘𝑛) = ((,)‘(𝐹𝑛)))
9974, 72, 49syl2anc 584 . . . . . . . . . 10 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (𝐹𝑛) = ⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩)
10099fveq2d 6778 . . . . . . . . 9 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ((,)‘(𝐹𝑛)) = ((,)‘⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩))
101 df-ov 7278 . . . . . . . . . . 11 ((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))) = ((,)‘⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩)
102101a1i 11 . . . . . . . . . 10 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))) = ((,)‘⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩))
103 simplr 766 . . . . . . . . . . . . 13 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → 𝑛 ∈ (ℕ ∖ 𝐴))
10472, 22syldan 591 . . . . . . . . . . . . . . 15 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (1st ‘(𝐹𝑛)) ∈ ℝ*)
105104adantr 481 . . . . . . . . . . . . . 14 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → (1st ‘(𝐹𝑛)) ∈ ℝ*)
10672, 24syldan 591 . . . . . . . . . . . . . . 15 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (2nd ‘(𝐹𝑛)) ∈ ℝ*)
107106adantr 481 . . . . . . . . . . . . . 14 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → (2nd ‘(𝐹𝑛)) ∈ ℝ*)
108 simpr 485 . . . . . . . . . . . . . . 15 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛)))
109105, 107xrltnled 42902 . . . . . . . . . . . . . . 15 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → ((1st ‘(𝐹𝑛)) < (2nd ‘(𝐹𝑛)) ↔ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))))
110108, 109mpbird 256 . . . . . . . . . . . . . 14 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → (1st ‘(𝐹𝑛)) < (2nd ‘(𝐹𝑛)))
111105, 107, 110xrltled 12884 . . . . . . . . . . . . 13 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → (1st ‘(𝐹𝑛)) ≤ (2nd ‘(𝐹𝑛)))
112103, 111, 78syl2anc 584 . . . . . . . . . . . 12 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → 𝑛𝐴)
11380ad2antlr 724 . . . . . . . . . . . 12 (((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) ∧ ¬ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))) → ¬ 𝑛𝐴)
114112, 113condan 815 . . . . . . . . . . 11 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛)))
115 ioo0 13104 . . . . . . . . . . . 12 (((1st ‘(𝐹𝑛)) ∈ ℝ* ∧ (2nd ‘(𝐹𝑛)) ∈ ℝ*) → (((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))) = ∅ ↔ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))))
116104, 106, 115syl2anc 584 . . . . . . . . . . 11 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))) = ∅ ↔ (2nd ‘(𝐹𝑛)) ≤ (1st ‘(𝐹𝑛))))
117114, 116mpbird 256 . . . . . . . . . 10 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))) = ∅)
118102, 117eqtr3d 2780 . . . . . . . . 9 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ((,)‘⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩) = ∅)
11998, 100, 1183eqtrd 2782 . . . . . . . 8 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (((,) ∘ 𝐹)‘𝑛) = ∅)
120119iuneq2dv 4948 . . . . . . 7 (𝜑 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐹)‘𝑛) = 𝑛 ∈ (ℕ ∖ 𝐴)∅)
121120, 95eqtrd 2778 . . . . . 6 (𝜑 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐹)‘𝑛) = ∅)
12296, 121eqtr4d 2781 . . . . 5 (𝜑 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐺)‘𝑛) = 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐹)‘𝑛))
12369, 122uneq12d 4098 . . . 4 (𝜑 → ( 𝑛𝐴 (((,) ∘ 𝐺)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐺)‘𝑛)) = ( 𝑛𝐴 (((,) ∘ 𝐹)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐹)‘𝑛)))
12434, 38, 1233eqtrrd 2783 . . 3 (𝜑 → ( 𝑛𝐴 (((,) ∘ 𝐹)‘𝑛) ∪ 𝑛 ∈ (ℕ ∖ 𝐴)(((,) ∘ 𝐹)‘𝑛)) = ran ((,) ∘ 𝐺))
1259, 19, 1243eqtrd 2782 . 2 (𝜑 ran ((,) ∘ 𝐹) = ran ((,) ∘ 𝐺))
126 volf 24693 . . . . . 6 vol:dom vol⟶(0[,]+∞)
127126a1i 11 . . . . 5 (𝜑 → vol:dom vol⟶(0[,]+∞))
1283adantr 481 . . . . . . . . . . 11 ((𝜑𝑛 ∈ ℕ) → 𝐹:ℕ⟶(ℝ* × ℝ*))
129 simpr 485 . . . . . . . . . . 11 ((𝜑𝑛 ∈ ℕ) → 𝑛 ∈ ℕ)
130128, 129, 45syl2anc 584 . . . . . . . . . 10 ((𝜑𝑛 ∈ ℕ) → (((,) ∘ 𝐹)‘𝑛) = ((,)‘(𝐹𝑛)))
13149fveq2d 6778 . . . . . . . . . 10 ((𝜑𝑛 ∈ ℕ) → ((,)‘(𝐹𝑛)) = ((,)‘⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩))
132101eqcomi 2747 . . . . . . . . . . 11 ((,)‘⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩) = ((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛)))
133132a1i 11 . . . . . . . . . 10 ((𝜑𝑛 ∈ ℕ) → ((,)‘⟨(1st ‘(𝐹𝑛)), (2nd ‘(𝐹𝑛))⟩) = ((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))))
134130, 131, 1333eqtrd 2782 . . . . . . . . 9 ((𝜑𝑛 ∈ ℕ) → (((,) ∘ 𝐹)‘𝑛) = ((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))))
135 ioombl 24729 . . . . . . . . . 10 ((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))) ∈ dom vol
136135a1i 11 . . . . . . . . 9 ((𝜑𝑛 ∈ ℕ) → ((1st ‘(𝐹𝑛))(,)(2nd ‘(𝐹𝑛))) ∈ dom vol)
137134, 136eqeltrd 2839 . . . . . . . 8 ((𝜑𝑛 ∈ ℕ) → (((,) ∘ 𝐹)‘𝑛) ∈ dom vol)
138137ralrimiva 3103 . . . . . . 7 (𝜑 → ∀𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛) ∈ dom vol)
1396, 138jca 512 . . . . . 6 (𝜑 → (((,) ∘ 𝐹) Fn ℕ ∧ ∀𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛) ∈ dom vol))
140 ffnfv 6992 . . . . . 6 (((,) ∘ 𝐹):ℕ⟶dom vol ↔ (((,) ∘ 𝐹) Fn ℕ ∧ ∀𝑛 ∈ ℕ (((,) ∘ 𝐹)‘𝑛) ∈ dom vol))
141139, 140sylibr 233 . . . . 5 (𝜑 → ((,) ∘ 𝐹):ℕ⟶dom vol)
142 fco 6624 . . . . 5 ((vol:dom vol⟶(0[,]+∞) ∧ ((,) ∘ 𝐹):ℕ⟶dom vol) → (vol ∘ ((,) ∘ 𝐹)):ℕ⟶(0[,]+∞))
143127, 141, 142syl2anc 584 . . . 4 (𝜑 → (vol ∘ ((,) ∘ 𝐹)):ℕ⟶(0[,]+∞))
144143ffnd 6601 . . 3 (𝜑 → (vol ∘ ((,) ∘ 𝐹)) Fn ℕ)
14568adantlr 712 . . . . . . . . . 10 (((𝜑𝑛 ∈ ℕ) ∧ 𝑛𝐴) → (((,) ∘ 𝐺)‘𝑛) = (((,) ∘ 𝐹)‘𝑛))
146137adantr 481 . . . . . . . . . 10 (((𝜑𝑛 ∈ ℕ) ∧ 𝑛𝐴) → (((,) ∘ 𝐹)‘𝑛) ∈ dom vol)
147145, 146eqeltrd 2839 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ 𝑛𝐴) → (((,) ∘ 𝐺)‘𝑛) ∈ dom vol)
148 simpll 764 . . . . . . . . . 10 (((𝜑𝑛 ∈ ℕ) ∧ ¬ 𝑛𝐴) → 𝜑)
149 eldif 3897 . . . . . . . . . . . . 13 (𝑛 ∈ (ℕ ∖ 𝐴) ↔ (𝑛 ∈ ℕ ∧ ¬ 𝑛𝐴))
150149bicomi 223 . . . . . . . . . . . 12 ((𝑛 ∈ ℕ ∧ ¬ 𝑛𝐴) ↔ 𝑛 ∈ (ℕ ∖ 𝐴))
151150biimpi 215 . . . . . . . . . . 11 ((𝑛 ∈ ℕ ∧ ¬ 𝑛𝐴) → 𝑛 ∈ (ℕ ∖ 𝐴))
152151adantll 711 . . . . . . . . . 10 (((𝜑𝑛 ∈ ℕ) ∧ ¬ 𝑛𝐴) → 𝑛 ∈ (ℕ ∖ 𝐴))
153117, 135eqeltrrdi 2848 . . . . . . . . . . 11 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → ∅ ∈ dom vol)
15492, 153eqeltrd 2839 . . . . . . . . . 10 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (((,) ∘ 𝐺)‘𝑛) ∈ dom vol)
155148, 152, 154syl2anc 584 . . . . . . . . 9 (((𝜑𝑛 ∈ ℕ) ∧ ¬ 𝑛𝐴) → (((,) ∘ 𝐺)‘𝑛) ∈ dom vol)
156147, 155pm2.61dan 810 . . . . . . . 8 ((𝜑𝑛 ∈ ℕ) → (((,) ∘ 𝐺)‘𝑛) ∈ dom vol)
157156ralrimiva 3103 . . . . . . 7 (𝜑 → ∀𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛) ∈ dom vol)
15831, 157jca 512 . . . . . 6 (𝜑 → (((,) ∘ 𝐺) Fn ℕ ∧ ∀𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛) ∈ dom vol))
159 ffnfv 6992 . . . . . 6 (((,) ∘ 𝐺):ℕ⟶dom vol ↔ (((,) ∘ 𝐺) Fn ℕ ∧ ∀𝑛 ∈ ℕ (((,) ∘ 𝐺)‘𝑛) ∈ dom vol))
160158, 159sylibr 233 . . . . 5 (𝜑 → ((,) ∘ 𝐺):ℕ⟶dom vol)
161 fco 6624 . . . . 5 ((vol:dom vol⟶(0[,]+∞) ∧ ((,) ∘ 𝐺):ℕ⟶dom vol) → (vol ∘ ((,) ∘ 𝐺)):ℕ⟶(0[,]+∞))
162127, 160, 161syl2anc 584 . . . 4 (𝜑 → (vol ∘ ((,) ∘ 𝐺)):ℕ⟶(0[,]+∞))
163162ffnd 6601 . . 3 (𝜑 → (vol ∘ ((,) ∘ 𝐺)) Fn ℕ)
164145eqcomd 2744 . . . . . 6 (((𝜑𝑛 ∈ ℕ) ∧ 𝑛𝐴) → (((,) ∘ 𝐹)‘𝑛) = (((,) ∘ 𝐺)‘𝑛))
165119, 92eqtr4d 2781 . . . . . . 7 ((𝜑𝑛 ∈ (ℕ ∖ 𝐴)) → (((,) ∘ 𝐹)‘𝑛) = (((,) ∘ 𝐺)‘𝑛))
166148, 152, 165syl2anc 584 . . . . . 6 (((𝜑𝑛 ∈ ℕ) ∧ ¬ 𝑛𝐴) → (((,) ∘ 𝐹)‘𝑛) = (((,) ∘ 𝐺)‘𝑛))
167164, 166pm2.61dan 810 . . . . 5 ((𝜑𝑛 ∈ ℕ) → (((,) ∘ 𝐹)‘𝑛) = (((,) ∘ 𝐺)‘𝑛))
168167fveq2d 6778 . . . 4 ((𝜑𝑛 ∈ ℕ) → (vol‘(((,) ∘ 𝐹)‘𝑛)) = (vol‘(((,) ∘ 𝐺)‘𝑛)))
169 fnfun 6533 . . . . . . 7 (((,) ∘ 𝐹) Fn ℕ → Fun ((,) ∘ 𝐹))
1706, 169syl 17 . . . . . 6 (𝜑 → Fun ((,) ∘ 𝐹))
171170adantr 481 . . . . 5 ((𝜑𝑛 ∈ ℕ) → Fun ((,) ∘ 𝐹))
1725fdmd 6611 . . . . . . . 8 (𝜑 → dom ((,) ∘ 𝐹) = ℕ)
173172eqcomd 2744 . . . . . . 7 (𝜑 → ℕ = dom ((,) ∘ 𝐹))
174173adantr 481 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → ℕ = dom ((,) ∘ 𝐹))
175129, 174eleqtrd 2841 . . . . 5 ((𝜑𝑛 ∈ ℕ) → 𝑛 ∈ dom ((,) ∘ 𝐹))
176 fvco 6866 . . . . 5 ((Fun ((,) ∘ 𝐹) ∧ 𝑛 ∈ dom ((,) ∘ 𝐹)) → ((vol ∘ ((,) ∘ 𝐹))‘𝑛) = (vol‘(((,) ∘ 𝐹)‘𝑛)))
177171, 175, 176syl2anc 584 . . . 4 ((𝜑𝑛 ∈ ℕ) → ((vol ∘ ((,) ∘ 𝐹))‘𝑛) = (vol‘(((,) ∘ 𝐹)‘𝑛)))
178 fnfun 6533 . . . . . . 7 (((,) ∘ 𝐺) Fn ℕ → Fun ((,) ∘ 𝐺))
17931, 178syl 17 . . . . . 6 (𝜑 → Fun ((,) ∘ 𝐺))
180179adantr 481 . . . . 5 ((𝜑𝑛 ∈ ℕ) → Fun ((,) ∘ 𝐺))
18130fdmd 6611 . . . . . . . 8 (𝜑 → dom ((,) ∘ 𝐺) = ℕ)
182181eqcomd 2744 . . . . . . 7 (𝜑 → ℕ = dom ((,) ∘ 𝐺))
183182adantr 481 . . . . . 6 ((𝜑𝑛 ∈ ℕ) → ℕ = dom ((,) ∘ 𝐺))
184129, 183eleqtrd 2841 . . . . 5 ((𝜑𝑛 ∈ ℕ) → 𝑛 ∈ dom ((,) ∘ 𝐺))
185 fvco 6866 . . . . 5 ((Fun ((,) ∘ 𝐺) ∧ 𝑛 ∈ dom ((,) ∘ 𝐺)) → ((vol ∘ ((,) ∘ 𝐺))‘𝑛) = (vol‘(((,) ∘ 𝐺)‘𝑛)))
186180, 184, 185syl2anc 584 . . . 4 ((𝜑𝑛 ∈ ℕ) → ((vol ∘ ((,) ∘ 𝐺))‘𝑛) = (vol‘(((,) ∘ 𝐺)‘𝑛)))
187168, 177, 1863eqtr4d 2788 . . 3 ((𝜑𝑛 ∈ ℕ) → ((vol ∘ ((,) ∘ 𝐹))‘𝑛) = ((vol ∘ ((,) ∘ 𝐺))‘𝑛))
188144, 163, 187eqfnfvd 6912 . 2 (𝜑 → (vol ∘ ((,) ∘ 𝐹)) = (vol ∘ ((,) ∘ 𝐺)))
189125, 188jca 512 1 (𝜑 → ( ran ((,) ∘ 𝐹) = ran ((,) ∘ 𝐺) ∧ (vol ∘ ((,) ∘ 𝐹)) = (vol ∘ ((,) ∘ 𝐺))))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 396   = wceq 1539  wcel 2106  wral 3064  {crab 3068  Vcvv 3432  cdif 3884  cun 3885  wss 3887  c0 4256  ifcif 4459  𝒫 cpw 4533  cop 4567   cuni 4839   ciun 4924   class class class wbr 5074  cmpt 5157   × cxp 5587  dom cdm 5589  ran crn 5590  ccom 5593  Fun wfun 6427   Fn wfn 6428  wf 6429  cfv 6433  (class class class)co 7275  1st c1st 7829  2nd c2nd 7830  cr 10870  0cc0 10871  +∞cpnf 11006  *cxr 11008   < clt 11009  cle 11010  cn 11973  (,)cioo 13079  [,]cicc 13082  volcvol 24627
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588  ax-inf2 9399  ax-cnex 10927  ax-resscn 10928  ax-1cn 10929  ax-icn 10930  ax-addcl 10931  ax-addrcl 10932  ax-mulcl 10933  ax-mulrcl 10934  ax-mulcom 10935  ax-addass 10936  ax-mulass 10937  ax-distr 10938  ax-i2m1 10939  ax-1ne0 10940  ax-1rid 10941  ax-rnegex 10942  ax-rrecex 10943  ax-cnre 10944  ax-pre-lttri 10945  ax-pre-lttrn 10946  ax-pre-ltadd 10947  ax-pre-mulgt0 10948  ax-pre-sup 10949
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-nel 3050  df-ral 3069  df-rex 3070  df-rmo 3071  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-int 4880  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-se 5545  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-pred 6202  df-ord 6269  df-on 6270  df-lim 6271  df-suc 6272  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-isom 6442  df-riota 7232  df-ov 7278  df-oprab 7279  df-mpo 7280  df-of 7533  df-om 7713  df-1st 7831  df-2nd 7832  df-frecs 8097  df-wrecs 8128  df-recs 8202  df-rdg 8241  df-1o 8297  df-2o 8298  df-er 8498  df-map 8617  df-pm 8618  df-en 8734  df-dom 8735  df-sdom 8736  df-fin 8737  df-sup 9201  df-inf 9202  df-oi 9269  df-dju 9659  df-card 9697  df-pnf 11011  df-mnf 11012  df-xr 11013  df-ltxr 11014  df-le 11015  df-sub 11207  df-neg 11208  df-div 11633  df-nn 11974  df-2 12036  df-3 12037  df-n0 12234  df-z 12320  df-uz 12583  df-q 12689  df-rp 12731  df-xadd 12849  df-ioo 13083  df-ico 13085  df-icc 13086  df-fz 13240  df-fzo 13383  df-fl 13512  df-seq 13722  df-exp 13783  df-hash 14045  df-cj 14810  df-re 14811  df-im 14812  df-sqrt 14946  df-abs 14947  df-clim 15197  df-rlim 15198  df-sum 15398  df-xmet 20590  df-met 20591  df-ovol 24628  df-vol 24629
This theorem is referenced by:  ovolval4lem2  44188
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