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Theorem ptbasfi 21307
Description: The basis for the product topology can also be written as the set of finite intersections of "cylinder sets", the preimages of projections into one factor from open sets in the factor. (We have to add 𝑋 itself to the list because if 𝐴 is empty we get (fi‘∅) = ∅ while 𝐵 = {∅}.) (Contributed by Mario Carneiro, 3-Feb-2015.)
Hypotheses
Ref Expression
ptbas.1 𝐵 = {𝑥 ∣ ∃𝑔((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))}
ptbasfi.2 𝑋 = X𝑛𝐴 (𝐹𝑛)
Assertion
Ref Expression
ptbasfi ((𝐴𝑉𝐹:𝐴⟶Top) → 𝐵 = (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
Distinct variable groups:   𝑘,𝑛,𝑢,𝐵   𝑤,𝑔,𝑥,𝑦,𝑛,𝑘,𝑢,𝑧,𝐴   𝑔,𝐹,𝑘,𝑛,𝑢,𝑤,𝑥,𝑦,𝑧   𝑔,𝑋,𝑘,𝑢,𝑤,𝑥,𝑧   𝑔,𝑉,𝑘,𝑛,𝑢,𝑤,𝑥,𝑦,𝑧
Allowed substitution hints:   𝐵(𝑥,𝑦,𝑧,𝑤,𝑔)   𝑋(𝑦,𝑛)

Proof of Theorem ptbasfi
Dummy variables 𝑠 𝑚 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ptbas.1 . . . . 5 𝐵 = {𝑥 ∣ ∃𝑔((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))}
21elpt 21298 . . . 4 (𝑠𝐵 ↔ ∃(( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) ∧ ∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦)) ∧ 𝑠 = X𝑦𝐴 (𝑦)))
3 df-3an 1038 . . . . . . . 8 (( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) ∧ ∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦)) ↔ (( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦)) ∧ ∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦)))
4 simprr 795 . . . . . . . . . . . . . 14 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))
5 disjdif2 4024 . . . . . . . . . . . . . . . . . 18 ((𝐴𝑚) = ∅ → (𝐴𝑚) = 𝐴)
65raleqdv 3136 . . . . . . . . . . . . . . . . 17 ((𝐴𝑚) = ∅ → (∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦) ↔ ∀𝑦𝐴 (𝑦) = (𝐹𝑦)))
76biimpac 503 . . . . . . . . . . . . . . . 16 ((∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦) ∧ (𝐴𝑚) = ∅) → ∀𝑦𝐴 (𝑦) = (𝐹𝑦))
8 ixpeq2 7874 . . . . . . . . . . . . . . . 16 (∀𝑦𝐴 (𝑦) = (𝐹𝑦) → X𝑦𝐴 (𝑦) = X𝑦𝐴 (𝐹𝑦))
97, 8syl 17 . . . . . . . . . . . . . . 15 ((∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦) ∧ (𝐴𝑚) = ∅) → X𝑦𝐴 (𝑦) = X𝑦𝐴 (𝐹𝑦))
10 ptbasfi.2 . . . . . . . . . . . . . . . 16 𝑋 = X𝑛𝐴 (𝐹𝑛)
11 fveq2 6153 . . . . . . . . . . . . . . . . . 18 (𝑛 = 𝑦 → (𝐹𝑛) = (𝐹𝑦))
1211unieqd 4417 . . . . . . . . . . . . . . . . 17 (𝑛 = 𝑦 (𝐹𝑛) = (𝐹𝑦))
1312cbvixpv 7878 . . . . . . . . . . . . . . . 16 X𝑛𝐴 (𝐹𝑛) = X𝑦𝐴 (𝐹𝑦)
1410, 13eqtri 2643 . . . . . . . . . . . . . . 15 𝑋 = X𝑦𝐴 (𝐹𝑦)
159, 14syl6eqr 2673 . . . . . . . . . . . . . 14 ((∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦) ∧ (𝐴𝑚) = ∅) → X𝑦𝐴 (𝑦) = 𝑋)
164, 15sylan 488 . . . . . . . . . . . . 13 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) = ∅) → X𝑦𝐴 (𝑦) = 𝑋)
17 ssv 3609 . . . . . . . . . . . . . . . 16 𝑋 ⊆ V
18 iineq1 4506 . . . . . . . . . . . . . . . . 17 ((𝐴𝑚) = ∅ → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = 𝑛 ∈ ∅ ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
19 0iin 4549 . . . . . . . . . . . . . . . . 17 𝑛 ∈ ∅ ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = V
2018, 19syl6eq 2671 . . . . . . . . . . . . . . . 16 ((𝐴𝑚) = ∅ → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = V)
2117, 20syl5sseqr 3638 . . . . . . . . . . . . . . 15 ((𝐴𝑚) = ∅ → 𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
2221adantl 482 . . . . . . . . . . . . . 14 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) = ∅) → 𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
23 df-ss 3573 . . . . . . . . . . . . . 14 (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ↔ (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) = 𝑋)
2422, 23sylib 208 . . . . . . . . . . . . 13 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) = ∅) → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) = 𝑋)
2516, 24eqtr4d 2658 . . . . . . . . . . . 12 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) = ∅) → X𝑦𝐴 (𝑦) = (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))))
26 simplll 797 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → (𝐴𝑉𝐹:𝐴⟶Top))
27 inss1 3816 . . . . . . . . . . . . . . . . 17 (𝐴𝑚) ⊆ 𝐴
28 simpr 477 . . . . . . . . . . . . . . . . 17 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → 𝑛 ∈ (𝐴𝑚))
2927, 28sseldi 3585 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → 𝑛𝐴)
30 simprr 795 . . . . . . . . . . . . . . . . . 18 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) → ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))
3130ad2antrr 761 . . . . . . . . . . . . . . . . 17 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))
32 fveq2 6153 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑛 → (𝑦) = (𝑛))
33 fveq2 6153 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑛 → (𝐹𝑦) = (𝐹𝑛))
3432, 33eleq12d 2692 . . . . . . . . . . . . . . . . . 18 (𝑦 = 𝑛 → ((𝑦) ∈ (𝐹𝑦) ↔ (𝑛) ∈ (𝐹𝑛)))
3534rspcv 3294 . . . . . . . . . . . . . . . . 17 (𝑛𝐴 → (∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) → (𝑛) ∈ (𝐹𝑛)))
3629, 31, 35sylc 65 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → (𝑛) ∈ (𝐹𝑛))
3714ptpjpre1 21297 . . . . . . . . . . . . . . . 16 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑛𝐴 ∧ (𝑛) ∈ (𝐹𝑛))) → ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = X𝑦𝐴 if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
3826, 29, 36, 37syl12anc 1321 . . . . . . . . . . . . . . 15 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = X𝑦𝐴 if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
3938adantlr 750 . . . . . . . . . . . . . 14 ((((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) ∧ 𝑛 ∈ (𝐴𝑚)) → ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = X𝑦𝐴 if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
4039iineq2dv 4514 . . . . . . . . . . . . 13 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = 𝑛 ∈ (𝐴𝑚)X𝑦𝐴 if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
41 simpr 477 . . . . . . . . . . . . . . . . 17 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → (𝐴𝑚) ≠ ∅)
42 cnvimass 5449 . . . . . . . . . . . . . . . . . . . 20 ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ dom (𝑤𝑋 ↦ (𝑤𝑛))
43 eqid 2621 . . . . . . . . . . . . . . . . . . . . 21 (𝑤𝑋 ↦ (𝑤𝑛)) = (𝑤𝑋 ↦ (𝑤𝑛))
4443dmmptss 5595 . . . . . . . . . . . . . . . . . . . 20 dom (𝑤𝑋 ↦ (𝑤𝑛)) ⊆ 𝑋
4542, 44sstri 3596 . . . . . . . . . . . . . . . . . . 19 ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ 𝑋
4645, 14sseqtri 3621 . . . . . . . . . . . . . . . . . 18 ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ X𝑦𝐴 (𝐹𝑦)
4746rgenw 2919 . . . . . . . . . . . . . . . . 17 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ X𝑦𝐴 (𝐹𝑦)
48 r19.2z 4037 . . . . . . . . . . . . . . . . 17 (((𝐴𝑚) ≠ ∅ ∧ ∀𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ X𝑦𝐴 (𝐹𝑦)) → ∃𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ X𝑦𝐴 (𝐹𝑦))
4941, 47, 48sylancl 693 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → ∃𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ X𝑦𝐴 (𝐹𝑦))
50 iinss 4542 . . . . . . . . . . . . . . . 16 (∃𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ X𝑦𝐴 (𝐹𝑦) → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ X𝑦𝐴 (𝐹𝑦))
5149, 50syl 17 . . . . . . . . . . . . . . 15 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ X𝑦𝐴 (𝐹𝑦))
5251, 14syl6sseqr 3636 . . . . . . . . . . . . . 14 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ 𝑋)
53 sseqin2 3800 . . . . . . . . . . . . . 14 ( 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ 𝑋 ↔ (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) = 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
5452, 53sylib 208 . . . . . . . . . . . . 13 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) = 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
5530ad2antrr 761 . . . . . . . . . . . . . . . . 17 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))
56 ssralv 3650 . . . . . . . . . . . . . . . . . 18 ((𝐴𝑚) ⊆ 𝐴 → (∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) → ∀𝑦 ∈ (𝐴𝑚)(𝑦) ∈ (𝐹𝑦)))
5727, 56ax-mp 5 . . . . . . . . . . . . . . . . 17 (∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) → ∀𝑦 ∈ (𝐴𝑚)(𝑦) ∈ (𝐹𝑦))
58 elssuni 4438 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝑦) ∈ (𝐹𝑦) → (𝑦) ⊆ (𝐹𝑦))
59 iffalse 4072 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑦 = 𝑛 → if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = (𝐹𝑦))
6059sseq2d 3617 . . . . . . . . . . . . . . . . . . . . . . . 24 𝑦 = 𝑛 → ((𝑦) ⊆ if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ↔ (𝑦) ⊆ (𝐹𝑦)))
6158, 60syl5ibrcom 237 . . . . . . . . . . . . . . . . . . . . . . 23 ((𝑦) ∈ (𝐹𝑦) → (¬ 𝑦 = 𝑛 → (𝑦) ⊆ if(𝑦 = 𝑛, (𝑛), (𝐹𝑦))))
62 ssid 3608 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑦) ⊆ (𝑦)
63 iftrue 4069 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑦 = 𝑛 → if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = (𝑛))
6463, 32eqtr4d 2658 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑦 = 𝑛 → if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = (𝑦))
6562, 64syl5sseqr 3638 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑦 = 𝑛 → (𝑦) ⊆ if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
6661, 65pm2.61d2 172 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑦) ∈ (𝐹𝑦) → (𝑦) ⊆ if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
6766ralrimivw 2962 . . . . . . . . . . . . . . . . . . . . 21 ((𝑦) ∈ (𝐹𝑦) → ∀𝑛 ∈ (𝐴𝑚)(𝑦) ⊆ if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
68 ssiin 4541 . . . . . . . . . . . . . . . . . . . . 21 ((𝑦) ⊆ 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ↔ ∀𝑛 ∈ (𝐴𝑚)(𝑦) ⊆ if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
6967, 68sylibr 224 . . . . . . . . . . . . . . . . . . . 20 ((𝑦) ∈ (𝐹𝑦) → (𝑦) ⊆ 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
7069adantl 482 . . . . . . . . . . . . . . . . . . 19 ((𝑦 ∈ (𝐴𝑚) ∧ (𝑦) ∈ (𝐹𝑦)) → (𝑦) ⊆ 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
7163equcoms 1944 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑛 = 𝑦 → if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = (𝑛))
72 fveq2 6153 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑛 = 𝑦 → (𝑛) = (𝑦))
7371, 72eqtrd 2655 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑛 = 𝑦 → if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = (𝑦))
7473sseq1d 3616 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑛 = 𝑦 → (if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ⊆ (𝑦) ↔ (𝑦) ⊆ (𝑦)))
7574rspcev 3298 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑦 ∈ (𝐴𝑚) ∧ (𝑦) ⊆ (𝑦)) → ∃𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ⊆ (𝑦))
7662, 75mpan2 706 . . . . . . . . . . . . . . . . . . . . 21 (𝑦 ∈ (𝐴𝑚) → ∃𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ⊆ (𝑦))
77 iinss 4542 . . . . . . . . . . . . . . . . . . . . 21 (∃𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ⊆ (𝑦) → 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ⊆ (𝑦))
7876, 77syl 17 . . . . . . . . . . . . . . . . . . . 20 (𝑦 ∈ (𝐴𝑚) → 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ⊆ (𝑦))
7978adantr 481 . . . . . . . . . . . . . . . . . . 19 ((𝑦 ∈ (𝐴𝑚) ∧ (𝑦) ∈ (𝐹𝑦)) → 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ⊆ (𝑦))
8070, 79eqssd 3604 . . . . . . . . . . . . . . . . . 18 ((𝑦 ∈ (𝐴𝑚) ∧ (𝑦) ∈ (𝐹𝑦)) → (𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
8180ralimiaa 2946 . . . . . . . . . . . . . . . . 17 (∀𝑦 ∈ (𝐴𝑚)(𝑦) ∈ (𝐹𝑦) → ∀𝑦 ∈ (𝐴𝑚)(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
8255, 57, 813syl 18 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → ∀𝑦 ∈ (𝐴𝑚)(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
83 eldifn 3716 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑦 ∈ (𝐴𝑚) → ¬ 𝑦𝑚)
8483ad2antlr 762 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) ∧ 𝑛 ∈ (𝐴𝑚)) → ¬ 𝑦𝑚)
85 inss2 3817 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝐴𝑚) ⊆ 𝑚
86 simpr 477 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) ∧ 𝑛 ∈ (𝐴𝑚)) → 𝑛 ∈ (𝐴𝑚))
8785, 86sseldi 3585 . . . . . . . . . . . . . . . . . . . . . . . 24 ((((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) ∧ 𝑛 ∈ (𝐴𝑚)) → 𝑛𝑚)
88 eleq1 2686 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑦 = 𝑛 → (𝑦𝑚𝑛𝑚))
8987, 88syl5ibrcom 237 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) ∧ 𝑛 ∈ (𝐴𝑚)) → (𝑦 = 𝑛𝑦𝑚))
9084, 89mtod 189 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) ∧ 𝑛 ∈ (𝐴𝑚)) → ¬ 𝑦 = 𝑛)
9190, 59syl 17 . . . . . . . . . . . . . . . . . . . . 21 ((((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) ∧ 𝑛 ∈ (𝐴𝑚)) → if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = (𝐹𝑦))
9291iineq2dv 4514 . . . . . . . . . . . . . . . . . . . 20 (((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) → 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = 𝑛 ∈ (𝐴𝑚) (𝐹𝑦))
93 iinconst 4501 . . . . . . . . . . . . . . . . . . . . 21 ((𝐴𝑚) ≠ ∅ → 𝑛 ∈ (𝐴𝑚) (𝐹𝑦) = (𝐹𝑦))
9493adantr 481 . . . . . . . . . . . . . . . . . . . 20 (((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) → 𝑛 ∈ (𝐴𝑚) (𝐹𝑦) = (𝐹𝑦))
9592, 94eqtr2d 2656 . . . . . . . . . . . . . . . . . . 19 (((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) → (𝐹𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
96 eqeq1 2625 . . . . . . . . . . . . . . . . . . 19 ((𝑦) = (𝐹𝑦) → ((𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ↔ (𝐹𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦))))
9795, 96syl5ibrcom 237 . . . . . . . . . . . . . . . . . 18 (((𝐴𝑚) ≠ ∅ ∧ 𝑦 ∈ (𝐴𝑚)) → ((𝑦) = (𝐹𝑦) → (𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦))))
9897ralimdva 2957 . . . . . . . . . . . . . . . . 17 ((𝐴𝑚) ≠ ∅ → (∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦) → ∀𝑦 ∈ (𝐴𝑚)(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦))))
994, 98mpan9 486 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → ∀𝑦 ∈ (𝐴𝑚)(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
100 inundif 4023 . . . . . . . . . . . . . . . . . 18 ((𝐴𝑚) ∪ (𝐴𝑚)) = 𝐴
101100raleqi 3134 . . . . . . . . . . . . . . . . 17 (∀𝑦 ∈ ((𝐴𝑚) ∪ (𝐴𝑚))(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ↔ ∀𝑦𝐴 (𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
102 ralunb 3777 . . . . . . . . . . . . . . . . 17 (∀𝑦 ∈ ((𝐴𝑚) ∪ (𝐴𝑚))(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ↔ (∀𝑦 ∈ (𝐴𝑚)(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦))))
103101, 102bitr3i 266 . . . . . . . . . . . . . . . 16 (∀𝑦𝐴 (𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ↔ (∀𝑦 ∈ (𝐴𝑚)(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦))))
10482, 99, 103sylanbrc 697 . . . . . . . . . . . . . . 15 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → ∀𝑦𝐴 (𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
105 ixpeq2 7874 . . . . . . . . . . . . . . 15 (∀𝑦𝐴 (𝑦) = 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) → X𝑦𝐴 (𝑦) = X𝑦𝐴 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
106104, 105syl 17 . . . . . . . . . . . . . 14 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → X𝑦𝐴 (𝑦) = X𝑦𝐴 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
107 ixpiin 7886 . . . . . . . . . . . . . . 15 ((𝐴𝑚) ≠ ∅ → X𝑦𝐴 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = 𝑛 ∈ (𝐴𝑚)X𝑦𝐴 if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
108107adantl 482 . . . . . . . . . . . . . 14 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → X𝑦𝐴 𝑛 ∈ (𝐴𝑚)if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)) = 𝑛 ∈ (𝐴𝑚)X𝑦𝐴 if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
109106, 108eqtrd 2655 . . . . . . . . . . . . 13 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → X𝑦𝐴 (𝑦) = 𝑛 ∈ (𝐴𝑚)X𝑦𝐴 if(𝑦 = 𝑛, (𝑛), (𝐹𝑦)))
11040, 54, 1093eqtr4rd 2666 . . . . . . . . . . . 12 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ (𝐴𝑚) ≠ ∅) → X𝑦𝐴 (𝑦) = (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))))
11125, 110pm2.61dane 2877 . . . . . . . . . . 11 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → X𝑦𝐴 (𝑦) = (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))))
112 ixpexg 7884 . . . . . . . . . . . . . . . . . . . . . . . 24 (∀𝑛𝐴 (𝐹𝑛) ∈ V → X𝑛𝐴 (𝐹𝑛) ∈ V)
113 fvex 6163 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝐹𝑛) ∈ V
114113uniex 6913 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝐹𝑛) ∈ V
115114a1i 11 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑛𝐴 (𝐹𝑛) ∈ V)
116112, 115mprg 2921 . . . . . . . . . . . . . . . . . . . . . . 23 X𝑛𝐴 (𝐹𝑛) ∈ V
11710, 116eqeltri 2694 . . . . . . . . . . . . . . . . . . . . . 22 𝑋 ∈ V
118117mptex 6446 . . . . . . . . . . . . . . . . . . . . 21 (𝑤𝑋 ↦ (𝑤𝑛)) ∈ V
119118cnvex 7067 . . . . . . . . . . . . . . . . . . . 20 (𝑤𝑋 ↦ (𝑤𝑛)) ∈ V
120119imaex 7058 . . . . . . . . . . . . . . . . . . 19 ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ∈ V
121120dfiin2 4526 . . . . . . . . . . . . . . . . . 18 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))}
122 inteq 4448 . . . . . . . . . . . . . . . . . 18 ({𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅ → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅)
123121, 122syl5eq 2667 . . . . . . . . . . . . . . . . 17 ({𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅ → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = ∅)
124 int0 4460 . . . . . . . . . . . . . . . . 17 ∅ = V
125123, 124syl6eq 2671 . . . . . . . . . . . . . . . 16 ({𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅ → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) = V)
126125ineq2d 3797 . . . . . . . . . . . . . . 15 ({𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅ → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) = (𝑋 ∩ V))
127 inv1 3947 . . . . . . . . . . . . . . 15 (𝑋 ∩ V) = 𝑋
128126, 127syl6eq 2671 . . . . . . . . . . . . . 14 ({𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅ → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) = 𝑋)
129128adantl 482 . . . . . . . . . . . . 13 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅) → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) = 𝑋)
130 snex 4874 . . . . . . . . . . . . . . . . . 18 {𝑋} ∈ V
1311ptbas 21305 . . . . . . . . . . . . . . . . . . 19 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝐵 ∈ TopBases)
1321, 10ptpjpre2 21306 . . . . . . . . . . . . . . . . . . . . . 22 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ (𝑘𝐴𝑢 ∈ (𝐹𝑘))) → ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢) ∈ 𝐵)
133132ralrimivva 2966 . . . . . . . . . . . . . . . . . . . . 21 ((𝐴𝑉𝐹:𝐴⟶Top) → ∀𝑘𝐴𝑢 ∈ (𝐹𝑘)((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢) ∈ 𝐵)
134 eqid 2621 . . . . . . . . . . . . . . . . . . . . . 22 (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) = (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))
135134fmpt2x 7188 . . . . . . . . . . . . . . . . . . . . 21 (∀𝑘𝐴𝑢 ∈ (𝐹𝑘)((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢) ∈ 𝐵 ↔ (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)): 𝑘𝐴 ({𝑘} × (𝐹𝑘))⟶𝐵)
136133, 135sylib 208 . . . . . . . . . . . . . . . . . . . 20 ((𝐴𝑉𝐹:𝐴⟶Top) → (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)): 𝑘𝐴 ({𝑘} × (𝐹𝑘))⟶𝐵)
137 frn 6015 . . . . . . . . . . . . . . . . . . . 20 ((𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)): 𝑘𝐴 ({𝑘} × (𝐹𝑘))⟶𝐵 → ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) ⊆ 𝐵)
138136, 137syl 17 . . . . . . . . . . . . . . . . . . 19 ((𝐴𝑉𝐹:𝐴⟶Top) → ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) ⊆ 𝐵)
139131, 138ssexd 4770 . . . . . . . . . . . . . . . . . 18 ((𝐴𝑉𝐹:𝐴⟶Top) → ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) ∈ V)
140 unexg 6919 . . . . . . . . . . . . . . . . . 18 (({𝑋} ∈ V ∧ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) ∈ V) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ∈ V)
141130, 139, 140sylancr 694 . . . . . . . . . . . . . . . . 17 ((𝐴𝑉𝐹:𝐴⟶Top) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ∈ V)
142 ssfii 8277 . . . . . . . . . . . . . . . . 17 (({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ∈ V → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
143141, 142syl 17 . . . . . . . . . . . . . . . 16 ((𝐴𝑉𝐹:𝐴⟶Top) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
144143ad2antrr 761 . . . . . . . . . . . . . . 15 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
145 ssun1 3759 . . . . . . . . . . . . . . . . 17 {𝑋} ⊆ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))
146117snss 4291 . . . . . . . . . . . . . . . . 17 (𝑋 ∈ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ↔ {𝑋} ⊆ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
147145, 146mpbir 221 . . . . . . . . . . . . . . . 16 𝑋 ∈ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))
148147a1i 11 . . . . . . . . . . . . . . 15 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → 𝑋 ∈ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
149144, 148sseldd 3588 . . . . . . . . . . . . . 14 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → 𝑋 ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
150149adantr 481 . . . . . . . . . . . . 13 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅) → 𝑋 ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
151129, 150eqeltrd 2698 . . . . . . . . . . . 12 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} = ∅) → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
152141ad3antrrr 765 . . . . . . . . . . . . . . . . . 18 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ∈ V)
153 nfv 1840 . . . . . . . . . . . . . . . . . . . . . 22 𝑛(((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦)))
154 nfcv 2761 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑛𝐴
155 nfcv 2761 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑛(𝐹𝑘)
156 nfixp1 7880 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 𝑛X𝑛𝐴 (𝐹𝑛)
15710, 156nfcxfr 2759 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 𝑛𝑋
158 nfcv 2761 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 𝑛(𝑤𝑘)
159157, 158nfmpt 4711 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 𝑛(𝑤𝑋 ↦ (𝑤𝑘))
160159nfcnv 5266 . . . . . . . . . . . . . . . . . . . . . . . . . 26 𝑛(𝑤𝑋 ↦ (𝑤𝑘))
161 nfcv 2761 . . . . . . . . . . . . . . . . . . . . . . . . . 26 𝑛𝑢
162160, 161nfima 5438 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑛((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)
163154, 155, 162nfmpt2 6684 . . . . . . . . . . . . . . . . . . . . . . . 24 𝑛(𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))
164163nfrn 5333 . . . . . . . . . . . . . . . . . . . . . . 23 𝑛ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))
165164nfcri 2755 . . . . . . . . . . . . . . . . . . . . . 22 𝑛 𝑧 ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))
166 df-ov 6613 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝑛(𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))(𝑛)) = ((𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))‘⟨𝑛, (𝑛)⟩)
167120a1i 11 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ∈ V)
168 fveq2 6153 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (𝑘 = 𝑛 → (𝑤𝑘) = (𝑤𝑛))
169168mpteq2dv 4710 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 (𝑘 = 𝑛 → (𝑤𝑋 ↦ (𝑤𝑘)) = (𝑤𝑋 ↦ (𝑤𝑛)))
170169cnveqd 5263 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (𝑘 = 𝑛(𝑤𝑋 ↦ (𝑤𝑘)) = (𝑤𝑋 ↦ (𝑤𝑛)))
171170imaeq1d 5429 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝑘 = 𝑛 → ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢) = ((𝑤𝑋 ↦ (𝑤𝑛)) “ 𝑢))
172 imaeq2 5426 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝑢 = (𝑛) → ((𝑤𝑋 ↦ (𝑤𝑛)) “ 𝑢) = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
173171, 172sylan9eq 2675 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((𝑘 = 𝑛𝑢 = (𝑛)) → ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢) = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
174 fveq2 6153 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝑘 = 𝑛 → (𝐹𝑘) = (𝐹𝑛))
175173, 174, 134ovmpt2x 6749 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((𝑛𝐴 ∧ (𝑛) ∈ (𝐹𝑛) ∧ ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ∈ V) → (𝑛(𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))(𝑛)) = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
17629, 36, 167, 175syl3anc 1323 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → (𝑛(𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))(𝑛)) = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
177166, 176syl5eqr 2669 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → ((𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))‘⟨𝑛, (𝑛)⟩) = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
178136ad3antrrr 765 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)): 𝑘𝐴 ({𝑘} × (𝐹𝑘))⟶𝐵)
179178ffnd 6008 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) Fn 𝑘𝐴 ({𝑘} × (𝐹𝑘)))
180 opeliunxp 5136 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (⟨𝑛, (𝑛)⟩ ∈ 𝑛𝐴 ({𝑛} × (𝐹𝑛)) ↔ (𝑛𝐴 ∧ (𝑛) ∈ (𝐹𝑛)))
18129, 36, 180sylanbrc 697 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → ⟨𝑛, (𝑛)⟩ ∈ 𝑛𝐴 ({𝑛} × (𝐹𝑛)))
182 sneq 4163 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝑛 = 𝑘 → {𝑛} = {𝑘})
183 fveq2 6153 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
184182, 183xpeq12d 5105 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝑛 = 𝑘 → ({𝑛} × (𝐹𝑛)) = ({𝑘} × (𝐹𝑘)))
185184cbviunv 4530 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 𝑛𝐴 ({𝑛} × (𝐹𝑛)) = 𝑘𝐴 ({𝑘} × (𝐹𝑘))
186181, 185syl6eleq 2708 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → ⟨𝑛, (𝑛)⟩ ∈ 𝑘𝐴 ({𝑘} × (𝐹𝑘)))
187 fnfvelrn 6317 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) Fn 𝑘𝐴 ({𝑘} × (𝐹𝑘)) ∧ ⟨𝑛, (𝑛)⟩ ∈ 𝑘𝐴 ({𝑘} × (𝐹𝑘))) → ((𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))‘⟨𝑛, (𝑛)⟩) ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))
188179, 186, 187syl2anc 692 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → ((𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))‘⟨𝑛, (𝑛)⟩) ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))
189177, 188eqeltrrd 2699 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))
190 eleq1 2686 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) → (𝑧 ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) ↔ ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
191189, 190syl5ibrcom 237 . . . . . . . . . . . . . . . . . . . . . . 23 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ 𝑛 ∈ (𝐴𝑚)) → (𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) → 𝑧 ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
192191ex 450 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → (𝑛 ∈ (𝐴𝑚) → (𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) → 𝑧 ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
193153, 165, 192rexlimd 3020 . . . . . . . . . . . . . . . . . . . . 21 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → (∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) → 𝑧 ∈ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
194193abssdv 3660 . . . . . . . . . . . . . . . . . . . 20 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ⊆ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))
195 ssun2 3760 . . . . . . . . . . . . . . . . . . . 20 ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) ⊆ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))
196194, 195syl6ss 3599 . . . . . . . . . . . . . . . . . . 19 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ⊆ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
197196adantr 481 . . . . . . . . . . . . . . . . . 18 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ⊆ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
198 simpr 477 . . . . . . . . . . . . . . . . . 18 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅)
199 simplrl 799 . . . . . . . . . . . . . . . . . . . 20 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → 𝑚 ∈ Fin)
200 ssfi 8132 . . . . . . . . . . . . . . . . . . . 20 ((𝑚 ∈ Fin ∧ (𝐴𝑚) ⊆ 𝑚) → (𝐴𝑚) ∈ Fin)
201199, 85, 200sylancl 693 . . . . . . . . . . . . . . . . . . 19 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → (𝐴𝑚) ∈ Fin)
202 abrexfi 8218 . . . . . . . . . . . . . . . . . . 19 ((𝐴𝑚) ∈ Fin → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ∈ Fin)
203201, 202syl 17 . . . . . . . . . . . . . . . . . 18 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ∈ Fin)
204 elfir 8273 . . . . . . . . . . . . . . . . . 18 ((({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ∈ V ∧ ({𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ⊆ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅ ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ∈ Fin)) → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
205152, 197, 198, 203, 204syl13anc 1325 . . . . . . . . . . . . . . . . 17 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
206121, 205syl5eqel 2702 . . . . . . . . . . . . . . . 16 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
207 elssuni 4438 . . . . . . . . . . . . . . . 16 ( 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))) → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
208206, 207syl 17 . . . . . . . . . . . . . . 15 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
209 fiuni 8286 . . . . . . . . . . . . . . . . . 18 (({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ∈ V → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) = (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
210141, 209syl 17 . . . . . . . . . . . . . . . . 17 ((𝐴𝑉𝐹:𝐴⟶Top) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) = (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
211117pwid 4150 . . . . . . . . . . . . . . . . . . . . . 22 𝑋 ∈ 𝒫 𝑋
212211a1i 11 . . . . . . . . . . . . . . . . . . . . 21 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝑋 ∈ 𝒫 𝑋)
213212snssd 4314 . . . . . . . . . . . . . . . . . . . 20 ((𝐴𝑉𝐹:𝐴⟶Top) → {𝑋} ⊆ 𝒫 𝑋)
2141ptuni2 21302 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝐴𝑉𝐹:𝐴⟶Top) → X𝑛𝐴 (𝐹𝑛) = 𝐵)
21510, 214syl5eq 2667 . . . . . . . . . . . . . . . . . . . . . . 23 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝑋 = 𝐵)
216 eqimss2 3642 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑋 = 𝐵 𝐵𝑋)
217215, 216syl 17 . . . . . . . . . . . . . . . . . . . . . 22 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝐵𝑋)
218 sspwuni 4582 . . . . . . . . . . . . . . . . . . . . . 22 (𝐵 ⊆ 𝒫 𝑋 𝐵𝑋)
219217, 218sylibr 224 . . . . . . . . . . . . . . . . . . . . 21 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝐵 ⊆ 𝒫 𝑋)
220138, 219sstrd 3597 . . . . . . . . . . . . . . . . . . . 20 ((𝐴𝑉𝐹:𝐴⟶Top) → ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)) ⊆ 𝒫 𝑋)
221213, 220unssd 3772 . . . . . . . . . . . . . . . . . . 19 ((𝐴𝑉𝐹:𝐴⟶Top) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ 𝒫 𝑋)
222 sspwuni 4582 . . . . . . . . . . . . . . . . . . 19 (({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ 𝒫 𝑋 ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ 𝑋)
223221, 222sylib 208 . . . . . . . . . . . . . . . . . 18 ((𝐴𝑉𝐹:𝐴⟶Top) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ 𝑋)
224 elssuni 4438 . . . . . . . . . . . . . . . . . . 19 (𝑋 ∈ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) → 𝑋 ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
225147, 224mp1i 13 . . . . . . . . . . . . . . . . . 18 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝑋 ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))
226223, 225eqssd 3604 . . . . . . . . . . . . . . . . 17 ((𝐴𝑉𝐹:𝐴⟶Top) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) = 𝑋)
227210, 226eqtr3d 2657 . . . . . . . . . . . . . . . 16 ((𝐴𝑉𝐹:𝐴⟶Top) → (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))) = 𝑋)
228227ad3antrrr 765 . . . . . . . . . . . . . . 15 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))) = 𝑋)
229208, 228sseqtrd 3625 . . . . . . . . . . . . . 14 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)) ⊆ 𝑋)
230229, 53sylib 208 . . . . . . . . . . . . 13 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) = 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛)))
231230, 206eqeltrd 2698 . . . . . . . . . . . 12 (((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) ∧ {𝑧 ∣ ∃𝑛 ∈ (𝐴𝑚)𝑧 = ((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))} ≠ ∅) → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
232151, 231pm2.61dane 2877 . . . . . . . . . . 11 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → (𝑋 𝑛 ∈ (𝐴𝑚)((𝑤𝑋 ↦ (𝑤𝑛)) “ (𝑛))) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
233111, 232eqeltrd 2698 . . . . . . . . . 10 ((((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) ∧ (𝑚 ∈ Fin ∧ ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → X𝑦𝐴 (𝑦) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
234233rexlimdvaa 3026 . . . . . . . . 9 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦))) → (∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦) → X𝑦𝐴 (𝑦) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))))
235234impr 648 . . . . . . . 8 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ (( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦)) ∧ ∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → X𝑦𝐴 (𝑦) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
2363, 235sylan2b 492 . . . . . . 7 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) ∧ ∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → X𝑦𝐴 (𝑦) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
237 eleq1 2686 . . . . . . 7 (𝑠 = X𝑦𝐴 (𝑦) → (𝑠 ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))) ↔ X𝑦𝐴 (𝑦) ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))))
238236, 237syl5ibrcom 237 . . . . . 6 (((𝐴𝑉𝐹:𝐴⟶Top) ∧ ( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) ∧ ∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦))) → (𝑠 = X𝑦𝐴 (𝑦) → 𝑠 ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))))
239238expimpd 628 . . . . 5 ((𝐴𝑉𝐹:𝐴⟶Top) → ((( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) ∧ ∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦)) ∧ 𝑠 = X𝑦𝐴 (𝑦)) → 𝑠 ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))))
240239exlimdv 1858 . . . 4 ((𝐴𝑉𝐹:𝐴⟶Top) → (∃(( Fn 𝐴 ∧ ∀𝑦𝐴 (𝑦) ∈ (𝐹𝑦) ∧ ∃𝑚 ∈ Fin ∀𝑦 ∈ (𝐴𝑚)(𝑦) = (𝐹𝑦)) ∧ 𝑠 = X𝑦𝐴 (𝑦)) → 𝑠 ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))))
2412, 240syl5bi 232 . . 3 ((𝐴𝑉𝐹:𝐴⟶Top) → (𝑠𝐵𝑠 ∈ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))))))
242241ssrdv 3593 . 2 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝐵 ⊆ (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
2431ptbasid 21301 . . . . . . 7 ((𝐴𝑉𝐹:𝐴⟶Top) → X𝑛𝐴 (𝐹𝑛) ∈ 𝐵)
24410, 243syl5eqel 2702 . . . . . 6 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝑋𝐵)
245244snssd 4314 . . . . 5 ((𝐴𝑉𝐹:𝐴⟶Top) → {𝑋} ⊆ 𝐵)
246245, 138unssd 3772 . . . 4 ((𝐴𝑉𝐹:𝐴⟶Top) → ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ 𝐵)
247 fiss 8282 . . . 4 ((𝐵 ∈ TopBases ∧ ({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢))) ⊆ 𝐵) → (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))) ⊆ (fi‘𝐵))
248131, 246, 247syl2anc 692 . . 3 ((𝐴𝑉𝐹:𝐴⟶Top) → (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))) ⊆ (fi‘𝐵))
2491ptbasin2 21304 . . 3 ((𝐴𝑉𝐹:𝐴⟶Top) → (fi‘𝐵) = 𝐵)
250248, 249sseqtrd 3625 . 2 ((𝐴𝑉𝐹:𝐴⟶Top) → (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))) ⊆ 𝐵)
251242, 250eqssd 3604 1 ((𝐴𝑉𝐹:𝐴⟶Top) → 𝐵 = (fi‘({𝑋} ∪ ran (𝑘𝐴, 𝑢 ∈ (𝐹𝑘) ↦ ((𝑤𝑋 ↦ (𝑤𝑘)) “ 𝑢)))))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 384  w3a 1036   = wceq 1480  wex 1701  wcel 1987  {cab 2607  wne 2790  wral 2907  wrex 2908  Vcvv 3189  cdif 3556  cun 3557  cin 3558  wss 3559  c0 3896  ifcif 4063  𝒫 cpw 4135  {csn 4153  cop 4159   cuni 4407   cint 4445   ciun 4490   ciin 4491  cmpt 4678   × cxp 5077  ccnv 5078  dom cdm 5079  ran crn 5080  cima 5082   Fn wfn 5847  wf 5848  cfv 5852  (class class class)co 6610  cmpt2 6612  Xcixp 7860  Fincfn 7907  ficfi 8268  Topctop 20630  TopBasesctb 20673
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 4736  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6909
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 3191  df-sbc 3422  df-csb 3519  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-pss 3575  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-tp 4158  df-op 4160  df-uni 4408  df-int 4446  df-iun 4492  df-iin 4493  df-br 4619  df-opab 4679  df-mpt 4680  df-tr 4718  df-eprel 4990  df-id 4994  df-po 5000  df-so 5001  df-fr 5038  df-we 5040  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-pred 5644  df-ord 5690  df-on 5691  df-lim 5692  df-suc 5693  df-iota 5815  df-fun 5854  df-fn 5855  df-f 5856  df-f1 5857  df-fo 5858  df-f1o 5859  df-fv 5860  df-ov 6613  df-oprab 6614  df-mpt2 6615  df-om 7020  df-1st 7120  df-2nd 7121  df-wrecs 7359  df-recs 7420  df-rdg 7458  df-1o 7512  df-oadd 7516  df-er 7694  df-ixp 7861  df-en 7908  df-dom 7909  df-fin 7911  df-fi 8269  df-top 20631  df-bases 20674
This theorem is referenced by:  ptval2  21327  xkoptsub  21380  ptcmplem1  21779  prdsxmslem2  22257
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