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Theorem ptbasin 21290
Description: The basis for a product topology is closed under intersections. (Contributed by Mario Carneiro, 3-Feb-2015.)
Hypothesis
Ref Expression
ptbas.1 𝐵 = {𝑥 ∣ ∃𝑔((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))}
Assertion
Ref Expression
ptbasin (((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑋𝐵𝑌𝐵)) → (𝑋𝑌) ∈ 𝐵)
Distinct variable groups:   𝑥,𝑔,𝑦,𝑧,𝐴   𝑔,𝑌,𝑥   𝑔,𝐹,𝑥,𝑦,𝑧   𝑔,𝑋,𝑥,𝑧   𝑔,𝑉,𝑥,𝑦,𝑧
Allowed substitution hints:   𝐵(𝑥,𝑦,𝑧,𝑔)   𝑋(𝑦)   𝑌(𝑦,𝑧)

Proof of Theorem ptbasin
Dummy variables 𝑎 𝑏 𝑐 𝑑 𝑘 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ptbas.1 . . . . . 6 𝐵 = {𝑥 ∣ ∃𝑔((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))}
21elpt 21285 . . . . 5 (𝑋𝐵 ↔ ∃𝑎((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ 𝑋 = X𝑦𝐴 (𝑎𝑦)))
31elpt 21285 . . . . 5 (𝑌𝐵 ↔ ∃𝑏((𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦)))
42, 3anbi12i 732 . . . 4 ((𝑋𝐵𝑌𝐵) ↔ (∃𝑎((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ 𝑋 = X𝑦𝐴 (𝑎𝑦)) ∧ ∃𝑏((𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))))
5 eeanv 2181 . . . 4 (∃𝑎𝑏(((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ 𝑋 = X𝑦𝐴 (𝑎𝑦)) ∧ ((𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))) ↔ (∃𝑎((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ 𝑋 = X𝑦𝐴 (𝑎𝑦)) ∧ ∃𝑏((𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))))
64, 5bitr4i 267 . . 3 ((𝑋𝐵𝑌𝐵) ↔ ∃𝑎𝑏(((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ 𝑋 = X𝑦𝐴 (𝑎𝑦)) ∧ ((𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))))
7 an4 864 . . . . 5 ((((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ 𝑋 = X𝑦𝐴 (𝑎𝑦)) ∧ ((𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))) ↔ (((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ (𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))) ∧ (𝑋 = X𝑦𝐴 (𝑎𝑦) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))))
8 an6 1405 . . . . . . . . 9 (((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ (𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))) ↔ ((𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦)) ∧ (∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))))
9 df-3an 1038 . . . . . . . . 9 (((𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦)) ∧ (∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))) ↔ (((𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ (∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))))
108, 9bitri 264 . . . . . . . 8 (((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ (𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))) ↔ (((𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ (∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))))
11 reeanv 3097 . . . . . . . . . . 11 (∃𝑐 ∈ Fin ∃𝑑 ∈ Fin (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ↔ (∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))
12 fveq2 6148 . . . . . . . . . . . . . . . 16 (𝑦 = 𝑘 → (𝑎𝑦) = (𝑎𝑘))
13 fveq2 6148 . . . . . . . . . . . . . . . 16 (𝑦 = 𝑘 → (𝑏𝑦) = (𝑏𝑘))
1412, 13ineq12d 3793 . . . . . . . . . . . . . . 15 (𝑦 = 𝑘 → ((𝑎𝑦) ∩ (𝑏𝑦)) = ((𝑎𝑘) ∩ (𝑏𝑘)))
1514cbvixpv 7870 . . . . . . . . . . . . . 14 X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) = X𝑘𝐴 ((𝑎𝑘) ∩ (𝑏𝑘))
16 simpl1l 1110 . . . . . . . . . . . . . . 15 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → 𝐴𝑉)
17 unfi 8171 . . . . . . . . . . . . . . . 16 ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) → (𝑐𝑑) ∈ Fin)
1817ad2antrl 763 . . . . . . . . . . . . . . 15 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → (𝑐𝑑) ∈ Fin)
19 simpl1r 1111 . . . . . . . . . . . . . . . . 17 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → 𝐹:𝐴⟶Top)
2019ffvelrnda 6315 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) ∧ 𝑘𝐴) → (𝐹𝑘) ∈ Top)
21 simpl3l 1114 . . . . . . . . . . . . . . . . 17 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦))
22 fveq2 6148 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑘 → (𝐹𝑦) = (𝐹𝑘))
2312, 22eleq12d 2692 . . . . . . . . . . . . . . . . . 18 (𝑦 = 𝑘 → ((𝑎𝑦) ∈ (𝐹𝑦) ↔ (𝑎𝑘) ∈ (𝐹𝑘)))
2423rspccva 3294 . . . . . . . . . . . . . . . . 17 ((∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ 𝑘𝐴) → (𝑎𝑘) ∈ (𝐹𝑘))
2521, 24sylan 488 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) ∧ 𝑘𝐴) → (𝑎𝑘) ∈ (𝐹𝑘))
26 simpl3r 1115 . . . . . . . . . . . . . . . . 17 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))
2713, 22eleq12d 2692 . . . . . . . . . . . . . . . . . 18 (𝑦 = 𝑘 → ((𝑏𝑦) ∈ (𝐹𝑦) ↔ (𝑏𝑘) ∈ (𝐹𝑘)))
2827rspccva 3294 . . . . . . . . . . . . . . . . 17 ((∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ 𝑘𝐴) → (𝑏𝑘) ∈ (𝐹𝑘))
2926, 28sylan 488 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) ∧ 𝑘𝐴) → (𝑏𝑘) ∈ (𝐹𝑘))
30 inopn 20629 . . . . . . . . . . . . . . . 16 (((𝐹𝑘) ∈ Top ∧ (𝑎𝑘) ∈ (𝐹𝑘) ∧ (𝑏𝑘) ∈ (𝐹𝑘)) → ((𝑎𝑘) ∩ (𝑏𝑘)) ∈ (𝐹𝑘))
3120, 25, 29, 30syl3anc 1323 . . . . . . . . . . . . . . 15 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) ∧ 𝑘𝐴) → ((𝑎𝑘) ∩ (𝑏𝑘)) ∈ (𝐹𝑘))
32 simprrl 803 . . . . . . . . . . . . . . . . . 18 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦))
33 ssun1 3754 . . . . . . . . . . . . . . . . . . . 20 𝑐 ⊆ (𝑐𝑑)
34 sscon 3722 . . . . . . . . . . . . . . . . . . . 20 (𝑐 ⊆ (𝑐𝑑) → (𝐴 ∖ (𝑐𝑑)) ⊆ (𝐴𝑐))
3533, 34ax-mp 5 . . . . . . . . . . . . . . . . . . 19 (𝐴 ∖ (𝑐𝑑)) ⊆ (𝐴𝑐)
3635sseli 3579 . . . . . . . . . . . . . . . . . 18 (𝑘 ∈ (𝐴 ∖ (𝑐𝑑)) → 𝑘 ∈ (𝐴𝑐))
3722unieqd 4412 . . . . . . . . . . . . . . . . . . . 20 (𝑦 = 𝑘 (𝐹𝑦) = (𝐹𝑘))
3812, 37eqeq12d 2636 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑘 → ((𝑎𝑦) = (𝐹𝑦) ↔ (𝑎𝑘) = (𝐹𝑘)))
3938rspccva 3294 . . . . . . . . . . . . . . . . . 18 ((∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ 𝑘 ∈ (𝐴𝑐)) → (𝑎𝑘) = (𝐹𝑘))
4032, 36, 39syl2an 494 . . . . . . . . . . . . . . . . 17 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) ∧ 𝑘 ∈ (𝐴 ∖ (𝑐𝑑))) → (𝑎𝑘) = (𝐹𝑘))
41 simprrr 804 . . . . . . . . . . . . . . . . . 18 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))
42 ssun2 3755 . . . . . . . . . . . . . . . . . . . 20 𝑑 ⊆ (𝑐𝑑)
43 sscon 3722 . . . . . . . . . . . . . . . . . . . 20 (𝑑 ⊆ (𝑐𝑑) → (𝐴 ∖ (𝑐𝑑)) ⊆ (𝐴𝑑))
4442, 43ax-mp 5 . . . . . . . . . . . . . . . . . . 19 (𝐴 ∖ (𝑐𝑑)) ⊆ (𝐴𝑑)
4544sseli 3579 . . . . . . . . . . . . . . . . . 18 (𝑘 ∈ (𝐴 ∖ (𝑐𝑑)) → 𝑘 ∈ (𝐴𝑑))
4613, 37eqeq12d 2636 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑘 → ((𝑏𝑦) = (𝐹𝑦) ↔ (𝑏𝑘) = (𝐹𝑘)))
4746rspccva 3294 . . . . . . . . . . . . . . . . . 18 ((∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦) ∧ 𝑘 ∈ (𝐴𝑑)) → (𝑏𝑘) = (𝐹𝑘))
4841, 45, 47syl2an 494 . . . . . . . . . . . . . . . . 17 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) ∧ 𝑘 ∈ (𝐴 ∖ (𝑐𝑑))) → (𝑏𝑘) = (𝐹𝑘))
4940, 48ineq12d 3793 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) ∧ 𝑘 ∈ (𝐴 ∖ (𝑐𝑑))) → ((𝑎𝑘) ∩ (𝑏𝑘)) = ( (𝐹𝑘) ∩ (𝐹𝑘)))
50 inidm 3800 . . . . . . . . . . . . . . . 16 ( (𝐹𝑘) ∩ (𝐹𝑘)) = (𝐹𝑘)
5149, 50syl6eq 2671 . . . . . . . . . . . . . . 15 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) ∧ 𝑘 ∈ (𝐴 ∖ (𝑐𝑑))) → ((𝑎𝑘) ∩ (𝑏𝑘)) = (𝐹𝑘))
521, 16, 18, 31, 51elptr2 21287 . . . . . . . . . . . . . 14 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → X𝑘𝐴 ((𝑎𝑘) ∩ (𝑏𝑘)) ∈ 𝐵)
5315, 52syl5eqel 2702 . . . . . . . . . . . . 13 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ ((𝑐 ∈ Fin ∧ 𝑑 ∈ Fin) ∧ (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) ∈ 𝐵)
5453expr 642 . . . . . . . . . . . 12 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ (𝑐 ∈ Fin ∧ 𝑑 ∈ Fin)) → ((∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) → X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) ∈ 𝐵))
5554rexlimdvva 3031 . . . . . . . . . . 11 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) → (∃𝑐 ∈ Fin ∃𝑑 ∈ Fin (∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) → X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) ∈ 𝐵))
5611, 55syl5bir 233 . . . . . . . . . 10 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) → ((∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) → X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) ∈ 𝐵))
57563expb 1263 . . . . . . . . 9 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ ((𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦)))) → ((∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) → X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) ∈ 𝐵))
5857impr 648 . . . . . . . 8 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ (((𝑎 Fn 𝐴𝑏 Fn 𝐴) ∧ (∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦))) ∧ (∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) ∈ 𝐵)
5910, 58sylan2b 492 . . . . . . 7 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ ((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ (𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) ∈ 𝐵)
60 ineq12 3787 . . . . . . . . 9 ((𝑋 = X𝑦𝐴 (𝑎𝑦) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦)) → (𝑋𝑌) = (X𝑦𝐴 (𝑎𝑦) ∩ X𝑦𝐴 (𝑏𝑦)))
61 ixpin 7877 . . . . . . . . 9 X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) = (X𝑦𝐴 (𝑎𝑦) ∩ X𝑦𝐴 (𝑏𝑦))
6260, 61syl6eqr 2673 . . . . . . . 8 ((𝑋 = X𝑦𝐴 (𝑎𝑦) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦)) → (𝑋𝑌) = X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)))
6362eleq1d 2683 . . . . . . 7 ((𝑋 = X𝑦𝐴 (𝑎𝑦) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦)) → ((𝑋𝑌) ∈ 𝐵X𝑦𝐴 ((𝑎𝑦) ∩ (𝑏𝑦)) ∈ 𝐵))
6459, 63syl5ibrcom 237 . . . . . 6 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ ((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ (𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)))) → ((𝑋 = X𝑦𝐴 (𝑎𝑦) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦)) → (𝑋𝑌) ∈ 𝐵))
6564expimpd 628 . . . . 5 ((𝐴𝑉𝐹:𝐴⟶Top) → ((((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ (𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦))) ∧ (𝑋 = X𝑦𝐴 (𝑎𝑦) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))) → (𝑋𝑌) ∈ 𝐵))
667, 65syl5bi 232 . . . 4 ((𝐴𝑉𝐹:𝐴⟶Top) → ((((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ 𝑋 = X𝑦𝐴 (𝑎𝑦)) ∧ ((𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))) → (𝑋𝑌) ∈ 𝐵))
6766exlimdvv 1859 . . 3 ((𝐴𝑉𝐹:𝐴⟶Top) → (∃𝑎𝑏(((𝑎 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑎𝑦) ∈ (𝐹𝑦) ∧ ∃𝑐 ∈ Fin ∀𝑦 ∈ (𝐴𝑐)(𝑎𝑦) = (𝐹𝑦)) ∧ 𝑋 = X𝑦𝐴 (𝑎𝑦)) ∧ ((𝑏 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑏𝑦) ∈ (𝐹𝑦) ∧ ∃𝑑 ∈ Fin ∀𝑦 ∈ (𝐴𝑑)(𝑏𝑦) = (𝐹𝑦)) ∧ 𝑌 = X𝑦𝐴 (𝑏𝑦))) → (𝑋𝑌) ∈ 𝐵))
686, 67syl5bi 232 . 2 ((𝐴𝑉𝐹:𝐴⟶Top) → ((𝑋𝐵𝑌𝐵) → (𝑋𝑌) ∈ 𝐵))
6968imp 445 1 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑋𝐵𝑌𝐵)) → (𝑋𝑌) ∈ 𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384  w3a 1036   = wceq 1480  wex 1701  wcel 1987  {cab 2607  wral 2907  wrex 2908  cdif 3552  cun 3553  cin 3554  wss 3555   cuni 4402   Fn wfn 5842  wf 5843  cfv 5847  Xcixp 7852  Fincfn 7899  Topctop 20617
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4731  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-reu 2914  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-oadd 7509  df-er 7687  df-ixp 7853  df-en 7900  df-fin 7903  df-top 20621
This theorem is referenced by:  ptbasin2  21291
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