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Theorem 2ndcctbss 21163
Description: If a topology is second-countable, every base has a countable subset which is a base. Exercise 16B2 in Willard. (Contributed by Jeff Hankins, 28-Jan-2010.) (Proof shortened by Mario Carneiro, 21-Mar-2015.)
Hypotheses
Ref Expression
2ndcctbss.1 𝑋 = 𝐵
2ndcctbss.2 𝐽 = (topGen‘𝐵)
2ndcctbss.3 𝑆 = {⟨𝑢, 𝑣⟩ ∣ (𝑢𝑐𝑣𝑐 ∧ ∃𝑤𝐵 (𝑢𝑤𝑤𝑣))}
Assertion
Ref Expression
2ndcctbss ((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) → ∃𝑏 ∈ TopBases (𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏)))
Distinct variable groups:   𝑏,𝑐,𝑢,𝑣,𝑤,𝐵   𝐽,𝑏,𝑐
Allowed substitution hints:   𝑆(𝑤,𝑣,𝑢,𝑏,𝑐)   𝐽(𝑤,𝑣,𝑢)   𝑋(𝑤,𝑣,𝑢,𝑏,𝑐)

Proof of Theorem 2ndcctbss
Dummy variables 𝑑 𝑓 𝑚 𝑛 𝑜 𝑡 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simpr 477 . . 3 ((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) → 𝐽 ∈ 2nd𝜔)
2 is2ndc 21154 . . 3 (𝐽 ∈ 2nd𝜔 ↔ ∃𝑐 ∈ TopBases (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))
31, 2sylib 208 . 2 ((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) → ∃𝑐 ∈ TopBases (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))
4 vex 3194 . . . . . . 7 𝑐 ∈ V
54, 4xpex 6916 . . . . . 6 (𝑐 × 𝑐) ∈ V
6 3simpa 1056 . . . . . . . 8 ((𝑢𝑐𝑣𝑐 ∧ ∃𝑤𝐵 (𝑢𝑤𝑤𝑣)) → (𝑢𝑐𝑣𝑐))
76ssopab2i 4968 . . . . . . 7 {⟨𝑢, 𝑣⟩ ∣ (𝑢𝑐𝑣𝑐 ∧ ∃𝑤𝐵 (𝑢𝑤𝑤𝑣))} ⊆ {⟨𝑢, 𝑣⟩ ∣ (𝑢𝑐𝑣𝑐)}
8 2ndcctbss.3 . . . . . . 7 𝑆 = {⟨𝑢, 𝑣⟩ ∣ (𝑢𝑐𝑣𝑐 ∧ ∃𝑤𝐵 (𝑢𝑤𝑤𝑣))}
9 df-xp 5085 . . . . . . 7 (𝑐 × 𝑐) = {⟨𝑢, 𝑣⟩ ∣ (𝑢𝑐𝑣𝑐)}
107, 8, 93sstr4i 3628 . . . . . 6 𝑆 ⊆ (𝑐 × 𝑐)
11 ssdomg 7946 . . . . . 6 ((𝑐 × 𝑐) ∈ V → (𝑆 ⊆ (𝑐 × 𝑐) → 𝑆 ≼ (𝑐 × 𝑐)))
125, 10, 11mp2 9 . . . . 5 𝑆 ≼ (𝑐 × 𝑐)
134xpdom1 8004 . . . . . . . . 9 (𝑐 ≼ ω → (𝑐 × 𝑐) ≼ (ω × 𝑐))
14 omex 8485 . . . . . . . . . 10 ω ∈ V
1514xpdom2 8000 . . . . . . . . 9 (𝑐 ≼ ω → (ω × 𝑐) ≼ (ω × ω))
16 domtr 7954 . . . . . . . . 9 (((𝑐 × 𝑐) ≼ (ω × 𝑐) ∧ (ω × 𝑐) ≼ (ω × ω)) → (𝑐 × 𝑐) ≼ (ω × ω))
1713, 15, 16syl2anc 692 . . . . . . . 8 (𝑐 ≼ ω → (𝑐 × 𝑐) ≼ (ω × ω))
18 xpomen 8783 . . . . . . . 8 (ω × ω) ≈ ω
19 domentr 7960 . . . . . . . 8 (((𝑐 × 𝑐) ≼ (ω × ω) ∧ (ω × ω) ≈ ω) → (𝑐 × 𝑐) ≼ ω)
2017, 18, 19sylancl 693 . . . . . . 7 (𝑐 ≼ ω → (𝑐 × 𝑐) ≼ ω)
2120adantr 481 . . . . . 6 ((𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽) → (𝑐 × 𝑐) ≼ ω)
2221ad2antll 764 . . . . 5 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → (𝑐 × 𝑐) ≼ ω)
23 domtr 7954 . . . . 5 ((𝑆 ≼ (𝑐 × 𝑐) ∧ (𝑐 × 𝑐) ≼ ω) → 𝑆 ≼ ω)
2412, 22, 23sylancr 694 . . . 4 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → 𝑆 ≼ ω)
258relopabi 5210 . . . . . . . . 9 Rel 𝑆
26 simpr 477 . . . . . . . . 9 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ 𝑥𝑆) → 𝑥𝑆)
27 1st2nd 7162 . . . . . . . . 9 ((Rel 𝑆𝑥𝑆) → 𝑥 = ⟨(1st𝑥), (2nd𝑥)⟩)
2825, 26, 27sylancr 694 . . . . . . . 8 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ 𝑥𝑆) → 𝑥 = ⟨(1st𝑥), (2nd𝑥)⟩)
2928, 26eqeltrrd 2705 . . . . . . 7 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ 𝑥𝑆) → ⟨(1st𝑥), (2nd𝑥)⟩ ∈ 𝑆)
30 df-br 4619 . . . . . . . . 9 ((1st𝑥)𝑆(2nd𝑥) ↔ ⟨(1st𝑥), (2nd𝑥)⟩ ∈ 𝑆)
31 fvex 6160 . . . . . . . . . 10 (1st𝑥) ∈ V
32 fvex 6160 . . . . . . . . . 10 (2nd𝑥) ∈ V
33 simpl 473 . . . . . . . . . . . 12 ((𝑢 = (1st𝑥) ∧ 𝑣 = (2nd𝑥)) → 𝑢 = (1st𝑥))
3433eleq1d 2688 . . . . . . . . . . 11 ((𝑢 = (1st𝑥) ∧ 𝑣 = (2nd𝑥)) → (𝑢𝑐 ↔ (1st𝑥) ∈ 𝑐))
35 simpr 477 . . . . . . . . . . . 12 ((𝑢 = (1st𝑥) ∧ 𝑣 = (2nd𝑥)) → 𝑣 = (2nd𝑥))
3635eleq1d 2688 . . . . . . . . . . 11 ((𝑢 = (1st𝑥) ∧ 𝑣 = (2nd𝑥)) → (𝑣𝑐 ↔ (2nd𝑥) ∈ 𝑐))
37 sseq1 3610 . . . . . . . . . . . . 13 (𝑢 = (1st𝑥) → (𝑢𝑤 ↔ (1st𝑥) ⊆ 𝑤))
38 sseq2 3611 . . . . . . . . . . . . 13 (𝑣 = (2nd𝑥) → (𝑤𝑣𝑤 ⊆ (2nd𝑥)))
3937, 38bi2anan9 916 . . . . . . . . . . . 12 ((𝑢 = (1st𝑥) ∧ 𝑣 = (2nd𝑥)) → ((𝑢𝑤𝑤𝑣) ↔ ((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥))))
4039rexbidv 3050 . . . . . . . . . . 11 ((𝑢 = (1st𝑥) ∧ 𝑣 = (2nd𝑥)) → (∃𝑤𝐵 (𝑢𝑤𝑤𝑣) ↔ ∃𝑤𝐵 ((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥))))
4134, 36, 403anbi123d 1396 . . . . . . . . . 10 ((𝑢 = (1st𝑥) ∧ 𝑣 = (2nd𝑥)) → ((𝑢𝑐𝑣𝑐 ∧ ∃𝑤𝐵 (𝑢𝑤𝑤𝑣)) ↔ ((1st𝑥) ∈ 𝑐 ∧ (2nd𝑥) ∈ 𝑐 ∧ ∃𝑤𝐵 ((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥)))))
4231, 32, 41, 8braba 4957 . . . . . . . . 9 ((1st𝑥)𝑆(2nd𝑥) ↔ ((1st𝑥) ∈ 𝑐 ∧ (2nd𝑥) ∈ 𝑐 ∧ ∃𝑤𝐵 ((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥))))
4330, 42bitr3i 266 . . . . . . . 8 (⟨(1st𝑥), (2nd𝑥)⟩ ∈ 𝑆 ↔ ((1st𝑥) ∈ 𝑐 ∧ (2nd𝑥) ∈ 𝑐 ∧ ∃𝑤𝐵 ((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥))))
4443simp3bi 1076 . . . . . . 7 (⟨(1st𝑥), (2nd𝑥)⟩ ∈ 𝑆 → ∃𝑤𝐵 ((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥)))
4529, 44syl 17 . . . . . 6 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ 𝑥𝑆) → ∃𝑤𝐵 ((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥)))
46 fvi 6213 . . . . . . . 8 (𝐵 ∈ TopBases → ( I ‘𝐵) = 𝐵)
4746ad3antrrr 765 . . . . . . 7 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ 𝑥𝑆) → ( I ‘𝐵) = 𝐵)
4847rexeqdv 3139 . . . . . 6 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ 𝑥𝑆) → (∃𝑤 ∈ ( I ‘𝐵)((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥)) ↔ ∃𝑤𝐵 ((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥))))
4945, 48mpbird 247 . . . . 5 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ 𝑥𝑆) → ∃𝑤 ∈ ( I ‘𝐵)((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥)))
5049ralrimiva 2965 . . . 4 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → ∀𝑥𝑆𝑤 ∈ ( I ‘𝐵)((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥)))
51 fvex 6160 . . . . 5 ( I ‘𝐵) ∈ V
52 sseq2 3611 . . . . . 6 (𝑤 = (𝑓𝑥) → ((1st𝑥) ⊆ 𝑤 ↔ (1st𝑥) ⊆ (𝑓𝑥)))
53 sseq1 3610 . . . . . 6 (𝑤 = (𝑓𝑥) → (𝑤 ⊆ (2nd𝑥) ↔ (𝑓𝑥) ⊆ (2nd𝑥)))
5452, 53anbi12d 746 . . . . 5 (𝑤 = (𝑓𝑥) → (((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥)) ↔ ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))))
5551, 54axcc4dom 9208 . . . 4 ((𝑆 ≼ ω ∧ ∀𝑥𝑆𝑤 ∈ ( I ‘𝐵)((1st𝑥) ⊆ 𝑤𝑤 ⊆ (2nd𝑥))) → ∃𝑓(𝑓:𝑆⟶( I ‘𝐵) ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))))
5624, 50, 55syl2anc 692 . . 3 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → ∃𝑓(𝑓:𝑆⟶( I ‘𝐵) ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))))
5746ad2antrr 761 . . . . . . 7 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → ( I ‘𝐵) = 𝐵)
5857feq3d 5991 . . . . . 6 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → (𝑓:𝑆⟶( I ‘𝐵) ↔ 𝑓:𝑆𝐵))
5958anbi1d 740 . . . . 5 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → ((𝑓:𝑆⟶( I ‘𝐵) ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ↔ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))))
60 2ndctop 21155 . . . . . . . . . . . 12 (𝐽 ∈ 2nd𝜔 → 𝐽 ∈ Top)
6160adantl 482 . . . . . . . . . . 11 ((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) → 𝐽 ∈ Top)
6261ad2antrr 761 . . . . . . . . . 10 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → 𝐽 ∈ Top)
63 frn 6012 . . . . . . . . . . . 12 (𝑓:𝑆𝐵 → ran 𝑓𝐵)
6463ad2antrl 763 . . . . . . . . . . 11 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → ran 𝑓𝐵)
65 bastg 20676 . . . . . . . . . . . . 13 (𝐵 ∈ TopBases → 𝐵 ⊆ (topGen‘𝐵))
6665ad3antrrr 765 . . . . . . . . . . . 12 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → 𝐵 ⊆ (topGen‘𝐵))
67 2ndcctbss.2 . . . . . . . . . . . 12 𝐽 = (topGen‘𝐵)
6866, 67syl6sseqr 3636 . . . . . . . . . . 11 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → 𝐵𝐽)
6964, 68sstrd 3598 . . . . . . . . . 10 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → ran 𝑓𝐽)
70 simprrl 803 . . . . . . . . . . . . . . 15 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) → 𝑜𝐽)
71 simprr 795 . . . . . . . . . . . . . . . 16 ((𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽)) → (topGen‘𝑐) = 𝐽)
7271ad2antlr 762 . . . . . . . . . . . . . . 15 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) → (topGen‘𝑐) = 𝐽)
7370, 72eleqtrrd 2707 . . . . . . . . . . . . . 14 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) → 𝑜 ∈ (topGen‘𝑐))
74 simprrr 804 . . . . . . . . . . . . . 14 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) → 𝑡𝑜)
75 tg2 20675 . . . . . . . . . . . . . 14 ((𝑜 ∈ (topGen‘𝑐) ∧ 𝑡𝑜) → ∃𝑑𝑐 (𝑡𝑑𝑑𝑜))
7673, 74, 75syl2anc 692 . . . . . . . . . . . . 13 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) → ∃𝑑𝑐 (𝑡𝑑𝑑𝑜))
77 bastg 20676 . . . . . . . . . . . . . . . . . . 19 (𝑐 ∈ TopBases → 𝑐 ⊆ (topGen‘𝑐))
7877ad2antrl 763 . . . . . . . . . . . . . . . . . 18 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → 𝑐 ⊆ (topGen‘𝑐))
7978ad2antrr 761 . . . . . . . . . . . . . . . . 17 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → 𝑐 ⊆ (topGen‘𝑐))
8067eqeq2i 2638 . . . . . . . . . . . . . . . . . . . . 21 ((topGen‘𝑐) = 𝐽 ↔ (topGen‘𝑐) = (topGen‘𝐵))
8180biimpi 206 . . . . . . . . . . . . . . . . . . . 20 ((topGen‘𝑐) = 𝐽 → (topGen‘𝑐) = (topGen‘𝐵))
8281adantl 482 . . . . . . . . . . . . . . . . . . 19 ((𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽) → (topGen‘𝑐) = (topGen‘𝐵))
8382ad2antll 764 . . . . . . . . . . . . . . . . . 18 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → (topGen‘𝑐) = (topGen‘𝐵))
8483ad2antrr 761 . . . . . . . . . . . . . . . . 17 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → (topGen‘𝑐) = (topGen‘𝐵))
8579, 84sseqtrd 3625 . . . . . . . . . . . . . . . 16 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → 𝑐 ⊆ (topGen‘𝐵))
86 simprl 793 . . . . . . . . . . . . . . . 16 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → 𝑑𝑐)
8785, 86sseldd 3589 . . . . . . . . . . . . . . 15 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → 𝑑 ∈ (topGen‘𝐵))
88 simprrl 803 . . . . . . . . . . . . . . 15 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → 𝑡𝑑)
89 tg2 20675 . . . . . . . . . . . . . . 15 ((𝑑 ∈ (topGen‘𝐵) ∧ 𝑡𝑑) → ∃𝑚𝐵 (𝑡𝑚𝑚𝑑))
9087, 88, 89syl2anc 692 . . . . . . . . . . . . . 14 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → ∃𝑚𝐵 (𝑡𝑚𝑚𝑑))
9165ad3antrrr 765 . . . . . . . . . . . . . . . . . . 19 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) → 𝐵 ⊆ (topGen‘𝐵))
9291ad2antrr 761 . . . . . . . . . . . . . . . . . 18 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → 𝐵 ⊆ (topGen‘𝐵))
9372ad2antrr 761 . . . . . . . . . . . . . . . . . . 19 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → (topGen‘𝑐) = 𝐽)
9493, 67syl6req 2677 . . . . . . . . . . . . . . . . . 18 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → (topGen‘𝐵) = (topGen‘𝑐))
9592, 94sseqtrd 3625 . . . . . . . . . . . . . . . . 17 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → 𝐵 ⊆ (topGen‘𝑐))
96 simprl 793 . . . . . . . . . . . . . . . . 17 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → 𝑚𝐵)
9795, 96sseldd 3589 . . . . . . . . . . . . . . . 16 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → 𝑚 ∈ (topGen‘𝑐))
98 simprrl 803 . . . . . . . . . . . . . . . 16 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → 𝑡𝑚)
99 tg2 20675 . . . . . . . . . . . . . . . 16 ((𝑚 ∈ (topGen‘𝑐) ∧ 𝑡𝑚) → ∃𝑛𝑐 (𝑡𝑛𝑛𝑚))
10097, 98, 99syl2anc 692 . . . . . . . . . . . . . . 15 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → ∃𝑛𝑐 (𝑡𝑛𝑛𝑚))
101 ffn 6004 . . . . . . . . . . . . . . . . . . . 20 (𝑓:𝑆𝐵𝑓 Fn 𝑆)
102101ad2antrr 761 . . . . . . . . . . . . . . . . . . 19 (((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜)) → 𝑓 Fn 𝑆)
103102ad2antlr 762 . . . . . . . . . . . . . . . . . 18 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → 𝑓 Fn 𝑆)
104103ad2antrr 761 . . . . . . . . . . . . . . . . 17 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑓 Fn 𝑆)
105 simprl 793 . . . . . . . . . . . . . . . . . 18 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑛𝑐)
10686ad2antrr 761 . . . . . . . . . . . . . . . . . 18 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑑𝑐)
107 simplrl 799 . . . . . . . . . . . . . . . . . . 19 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑚𝐵)
108 simprrr 804 . . . . . . . . . . . . . . . . . . 19 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑛𝑚)
109 simprr 795 . . . . . . . . . . . . . . . . . . . 20 ((𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑)) → 𝑚𝑑)
110109ad2antlr 762 . . . . . . . . . . . . . . . . . . 19 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑚𝑑)
111 sseq2 3611 . . . . . . . . . . . . . . . . . . . . 21 (𝑤 = 𝑚 → (𝑛𝑤𝑛𝑚))
112 sseq1 3610 . . . . . . . . . . . . . . . . . . . . 21 (𝑤 = 𝑚 → (𝑤𝑑𝑚𝑑))
113111, 112anbi12d 746 . . . . . . . . . . . . . . . . . . . 20 (𝑤 = 𝑚 → ((𝑛𝑤𝑤𝑑) ↔ (𝑛𝑚𝑚𝑑)))
114113rspcev 3300 . . . . . . . . . . . . . . . . . . 19 ((𝑚𝐵 ∧ (𝑛𝑚𝑚𝑑)) → ∃𝑤𝐵 (𝑛𝑤𝑤𝑑))
115107, 108, 110, 114syl12anc 1321 . . . . . . . . . . . . . . . . . 18 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → ∃𝑤𝐵 (𝑛𝑤𝑤𝑑))
116 df-br 4619 . . . . . . . . . . . . . . . . . . 19 (𝑛𝑆𝑑 ↔ ⟨𝑛, 𝑑⟩ ∈ 𝑆)
117 vex 3194 . . . . . . . . . . . . . . . . . . . 20 𝑛 ∈ V
118 vex 3194 . . . . . . . . . . . . . . . . . . . 20 𝑑 ∈ V
119 simpl 473 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑢 = 𝑛𝑣 = 𝑑) → 𝑢 = 𝑛)
120119eleq1d 2688 . . . . . . . . . . . . . . . . . . . . 21 ((𝑢 = 𝑛𝑣 = 𝑑) → (𝑢𝑐𝑛𝑐))
121 simpr 477 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑢 = 𝑛𝑣 = 𝑑) → 𝑣 = 𝑑)
122121eleq1d 2688 . . . . . . . . . . . . . . . . . . . . 21 ((𝑢 = 𝑛𝑣 = 𝑑) → (𝑣𝑐𝑑𝑐))
123 sseq1 3610 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑢 = 𝑛 → (𝑢𝑤𝑛𝑤))
124 sseq2 3611 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑣 = 𝑑 → (𝑤𝑣𝑤𝑑))
125123, 124bi2anan9 916 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑢 = 𝑛𝑣 = 𝑑) → ((𝑢𝑤𝑤𝑣) ↔ (𝑛𝑤𝑤𝑑)))
126125rexbidv 3050 . . . . . . . . . . . . . . . . . . . . 21 ((𝑢 = 𝑛𝑣 = 𝑑) → (∃𝑤𝐵 (𝑢𝑤𝑤𝑣) ↔ ∃𝑤𝐵 (𝑛𝑤𝑤𝑑)))
127120, 122, 1263anbi123d 1396 . . . . . . . . . . . . . . . . . . . 20 ((𝑢 = 𝑛𝑣 = 𝑑) → ((𝑢𝑐𝑣𝑐 ∧ ∃𝑤𝐵 (𝑢𝑤𝑤𝑣)) ↔ (𝑛𝑐𝑑𝑐 ∧ ∃𝑤𝐵 (𝑛𝑤𝑤𝑑))))
128117, 118, 127, 8braba 4957 . . . . . . . . . . . . . . . . . . 19 (𝑛𝑆𝑑 ↔ (𝑛𝑐𝑑𝑐 ∧ ∃𝑤𝐵 (𝑛𝑤𝑤𝑑)))
129116, 128bitr3i 266 . . . . . . . . . . . . . . . . . 18 (⟨𝑛, 𝑑⟩ ∈ 𝑆 ↔ (𝑛𝑐𝑑𝑐 ∧ ∃𝑤𝐵 (𝑛𝑤𝑤𝑑)))
130105, 106, 115, 129syl3anbrc 1244 . . . . . . . . . . . . . . . . 17 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → ⟨𝑛, 𝑑⟩ ∈ 𝑆)
131 fnfvelrn 6313 . . . . . . . . . . . . . . . . 17 ((𝑓 Fn 𝑆 ∧ ⟨𝑛, 𝑑⟩ ∈ 𝑆) → (𝑓‘⟨𝑛, 𝑑⟩) ∈ ran 𝑓)
132104, 130, 131syl2anc 692 . . . . . . . . . . . . . . . 16 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → (𝑓‘⟨𝑛, 𝑑⟩) ∈ ran 𝑓)
133 simprl 793 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑛𝑐)
134 simplll 797 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑑𝑐)
135 simplrl 799 . . . . . . . . . . . . . . . . . . . . . . . 24 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑚𝐵)
136 simprrr 804 . . . . . . . . . . . . . . . . . . . . . . . 24 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑛𝑚)
137109ad2antlr 762 . . . . . . . . . . . . . . . . . . . . . . . 24 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → 𝑚𝑑)
138135, 136, 137, 114syl12anc 1321 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → ∃𝑤𝐵 (𝑛𝑤𝑤𝑑))
139133, 134, 138, 129syl3anbrc 1244 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → ⟨𝑛, 𝑑⟩ ∈ 𝑆)
140 fveq2 6150 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑥 = ⟨𝑛, 𝑑⟩ → (1st𝑥) = (1st ‘⟨𝑛, 𝑑⟩))
141 fveq2 6150 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑥 = ⟨𝑛, 𝑑⟩ → (𝑓𝑥) = (𝑓‘⟨𝑛, 𝑑⟩))
142140, 141sseq12d 3618 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑥 = ⟨𝑛, 𝑑⟩ → ((1st𝑥) ⊆ (𝑓𝑥) ↔ (1st ‘⟨𝑛, 𝑑⟩) ⊆ (𝑓‘⟨𝑛, 𝑑⟩)))
143 fveq2 6150 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑥 = ⟨𝑛, 𝑑⟩ → (2nd𝑥) = (2nd ‘⟨𝑛, 𝑑⟩))
144141, 143sseq12d 3618 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑥 = ⟨𝑛, 𝑑⟩ → ((𝑓𝑥) ⊆ (2nd𝑥) ↔ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ (2nd ‘⟨𝑛, 𝑑⟩)))
145142, 144anbi12d 746 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑥 = ⟨𝑛, 𝑑⟩ → (((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)) ↔ ((1st ‘⟨𝑛, 𝑑⟩) ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ (2nd ‘⟨𝑛, 𝑑⟩))))
146145rspcv 3296 . . . . . . . . . . . . . . . . . . . . . 22 (⟨𝑛, 𝑑⟩ ∈ 𝑆 → (∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)) → ((1st ‘⟨𝑛, 𝑑⟩) ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ (2nd ‘⟨𝑛, 𝑑⟩))))
147139, 146syl 17 . . . . . . . . . . . . . . . . . . . . 21 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → (∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)) → ((1st ‘⟨𝑛, 𝑑⟩) ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ (2nd ‘⟨𝑛, 𝑑⟩))))
148117, 118op1st 7124 . . . . . . . . . . . . . . . . . . . . . . . 24 (1st ‘⟨𝑛, 𝑑⟩) = 𝑛
149148sseq1i 3613 . . . . . . . . . . . . . . . . . . . . . . 23 ((1st ‘⟨𝑛, 𝑑⟩) ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ↔ 𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩))
150117, 118op2nd 7125 . . . . . . . . . . . . . . . . . . . . . . . 24 (2nd ‘⟨𝑛, 𝑑⟩) = 𝑑
151150sseq2i 3614 . . . . . . . . . . . . . . . . . . . . . . 23 ((𝑓‘⟨𝑛, 𝑑⟩) ⊆ (2nd ‘⟨𝑛, 𝑑⟩) ↔ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)
152149, 151anbi12i 732 . . . . . . . . . . . . . . . . . . . . . 22 (((1st ‘⟨𝑛, 𝑑⟩) ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ (2nd ‘⟨𝑛, 𝑑⟩)) ↔ (𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑))
153 simprl 793 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) ∧ (𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)) → 𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩))
154 simprl 793 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚)) → 𝑡𝑛)
155154ad2antlr 762 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) ∧ (𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)) → 𝑡𝑛)
156153, 155sseldd 3589 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) ∧ (𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)) → 𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩))
157 simprr 795 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) ∧ (𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)) → (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)
158 simplrr 800 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → 𝑑𝑜)
159158ad2antrr 761 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) ∧ (𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)) → 𝑑𝑜)
160157, 159sstrd 3598 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) ∧ (𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)) → (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)
161156, 160jca 554 . . . . . . . . . . . . . . . . . . . . . . 23 (((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) ∧ (𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑)) → (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜))
162161ex 450 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → ((𝑛 ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑑) → (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)))
163152, 162syl5bi 232 . . . . . . . . . . . . . . . . . . . . 21 ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → (((1st ‘⟨𝑛, 𝑑⟩) ⊆ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ (2nd ‘⟨𝑛, 𝑑⟩)) → (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)))
164147, 163syldc 48 . . . . . . . . . . . . . . . . . . . 20 (∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)) → ((((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)))
165164exp4c 635 . . . . . . . . . . . . . . . . . . 19 (∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)) → ((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) → ((𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑)) → ((𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚)) → (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)))))
166165ad2antlr 762 . . . . . . . . . . . . . . . . . 18 (((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜)) → ((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) → ((𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑)) → ((𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚)) → (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)))))
167166adantl 482 . . . . . . . . . . . . . . . . 17 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) → ((𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜)) → ((𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑)) → ((𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚)) → (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)))))
168167imp41 618 . . . . . . . . . . . . . . . 16 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜))
169 eleq2 2693 . . . . . . . . . . . . . . . . . 18 (𝑏 = (𝑓‘⟨𝑛, 𝑑⟩) → (𝑡𝑏𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩)))
170 sseq1 3610 . . . . . . . . . . . . . . . . . 18 (𝑏 = (𝑓‘⟨𝑛, 𝑑⟩) → (𝑏𝑜 ↔ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜))
171169, 170anbi12d 746 . . . . . . . . . . . . . . . . 17 (𝑏 = (𝑓‘⟨𝑛, 𝑑⟩) → ((𝑡𝑏𝑏𝑜) ↔ (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)))
172171rspcev 3300 . . . . . . . . . . . . . . . 16 (((𝑓‘⟨𝑛, 𝑑⟩) ∈ ran 𝑓 ∧ (𝑡 ∈ (𝑓‘⟨𝑛, 𝑑⟩) ∧ (𝑓‘⟨𝑛, 𝑑⟩) ⊆ 𝑜)) → ∃𝑏 ∈ ran 𝑓(𝑡𝑏𝑏𝑜))
173132, 168, 172syl2anc 692 . . . . . . . . . . . . . . 15 (((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) ∧ (𝑛𝑐 ∧ (𝑡𝑛𝑛𝑚))) → ∃𝑏 ∈ ran 𝑓(𝑡𝑏𝑏𝑜))
174100, 173rexlimddv 3033 . . . . . . . . . . . . . 14 ((((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) ∧ (𝑚𝐵 ∧ (𝑡𝑚𝑚𝑑))) → ∃𝑏 ∈ ran 𝑓(𝑡𝑏𝑏𝑜))
17590, 174rexlimddv 3033 . . . . . . . . . . . . 13 (((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) ∧ (𝑑𝑐 ∧ (𝑡𝑑𝑑𝑜))) → ∃𝑏 ∈ ran 𝑓(𝑡𝑏𝑏𝑜))
17676, 175rexlimddv 3033 . . . . . . . . . . . 12 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) ∧ (𝑜𝐽𝑡𝑜))) → ∃𝑏 ∈ ran 𝑓(𝑡𝑏𝑏𝑜))
177176expr 642 . . . . . . . . . . 11 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → ((𝑜𝐽𝑡𝑜) → ∃𝑏 ∈ ran 𝑓(𝑡𝑏𝑏𝑜)))
178177ralrimivv 2969 . . . . . . . . . 10 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → ∀𝑜𝐽𝑡𝑜𝑏 ∈ ran 𝑓(𝑡𝑏𝑏𝑜))
179 basgen2 20699 . . . . . . . . . 10 ((𝐽 ∈ Top ∧ ran 𝑓𝐽 ∧ ∀𝑜𝐽𝑡𝑜𝑏 ∈ ran 𝑓(𝑡𝑏𝑏𝑜)) → (topGen‘ran 𝑓) = 𝐽)
18062, 69, 178, 179syl3anc 1323 . . . . . . . . 9 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → (topGen‘ran 𝑓) = 𝐽)
181180, 62eqeltrd 2704 . . . . . . . 8 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → (topGen‘ran 𝑓) ∈ Top)
182 tgclb 20680 . . . . . . . 8 (ran 𝑓 ∈ TopBases ↔ (topGen‘ran 𝑓) ∈ Top)
183181, 182sylibr 224 . . . . . . 7 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → ran 𝑓 ∈ TopBases)
184 omelon 8488 . . . . . . . . . 10 ω ∈ On
18524adantr 481 . . . . . . . . . 10 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → 𝑆 ≼ ω)
186 ondomen 8805 . . . . . . . . . 10 ((ω ∈ On ∧ 𝑆 ≼ ω) → 𝑆 ∈ dom card)
187184, 185, 186sylancr 694 . . . . . . . . 9 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → 𝑆 ∈ dom card)
188101ad2antrl 763 . . . . . . . . . 10 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → 𝑓 Fn 𝑆)
189 dffn4 6080 . . . . . . . . . 10 (𝑓 Fn 𝑆𝑓:𝑆onto→ran 𝑓)
190188, 189sylib 208 . . . . . . . . 9 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → 𝑓:𝑆onto→ran 𝑓)
191 fodomnum 8825 . . . . . . . . 9 (𝑆 ∈ dom card → (𝑓:𝑆onto→ran 𝑓 → ran 𝑓𝑆))
192187, 190, 191sylc 65 . . . . . . . 8 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → ran 𝑓𝑆)
193 domtr 7954 . . . . . . . 8 ((ran 𝑓𝑆𝑆 ≼ ω) → ran 𝑓 ≼ ω)
194192, 185, 193syl2anc 692 . . . . . . 7 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → ran 𝑓 ≼ ω)
195180eqcomd 2632 . . . . . . 7 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → 𝐽 = (topGen‘ran 𝑓))
196 breq1 4621 . . . . . . . . 9 (𝑏 = ran 𝑓 → (𝑏 ≼ ω ↔ ran 𝑓 ≼ ω))
197 sseq1 3610 . . . . . . . . 9 (𝑏 = ran 𝑓 → (𝑏𝐵 ↔ ran 𝑓𝐵))
198 fveq2 6150 . . . . . . . . . 10 (𝑏 = ran 𝑓 → (topGen‘𝑏) = (topGen‘ran 𝑓))
199198eqeq2d 2636 . . . . . . . . 9 (𝑏 = ran 𝑓 → (𝐽 = (topGen‘𝑏) ↔ 𝐽 = (topGen‘ran 𝑓)))
200196, 197, 1993anbi123d 1396 . . . . . . . 8 (𝑏 = ran 𝑓 → ((𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏)) ↔ (ran 𝑓 ≼ ω ∧ ran 𝑓𝐵𝐽 = (topGen‘ran 𝑓))))
201200rspcev 3300 . . . . . . 7 ((ran 𝑓 ∈ TopBases ∧ (ran 𝑓 ≼ ω ∧ ran 𝑓𝐵𝐽 = (topGen‘ran 𝑓))) → ∃𝑏 ∈ TopBases (𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏)))
202183, 194, 64, 195, 201syl13anc 1325 . . . . . 6 ((((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) ∧ (𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥)))) → ∃𝑏 ∈ TopBases (𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏)))
203202ex 450 . . . . 5 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → ((𝑓:𝑆𝐵 ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) → ∃𝑏 ∈ TopBases (𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏))))
20459, 203sylbid 230 . . . 4 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → ((𝑓:𝑆⟶( I ‘𝐵) ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) → ∃𝑏 ∈ TopBases (𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏))))
205204exlimdv 1863 . . 3 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → (∃𝑓(𝑓:𝑆⟶( I ‘𝐵) ∧ ∀𝑥𝑆 ((1st𝑥) ⊆ (𝑓𝑥) ∧ (𝑓𝑥) ⊆ (2nd𝑥))) → ∃𝑏 ∈ TopBases (𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏))))
20656, 205mpd 15 . 2 (((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) ∧ (𝑐 ∈ TopBases ∧ (𝑐 ≼ ω ∧ (topGen‘𝑐) = 𝐽))) → ∃𝑏 ∈ TopBases (𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏)))
2073, 206rexlimddv 3033 1 ((𝐵 ∈ TopBases ∧ 𝐽 ∈ 2nd𝜔) → ∃𝑏 ∈ TopBases (𝑏 ≼ ω ∧ 𝑏𝐵𝐽 = (topGen‘𝑏)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384  w3a 1036   = wceq 1480  wex 1701  wcel 1992  wral 2912  wrex 2913  Vcvv 3191  wss 3560  cop 4159   cuni 4407   class class class wbr 4618  {copab 4677   I cid 4989   × cxp 5077  dom cdm 5079  ran crn 5080  Rel wrel 5084  Oncon0 5685   Fn wfn 5845  wf 5846  ontowfo 5848  cfv 5850  ωcom 7013  1st c1st 7114  2nd c2nd 7115  cen 7897  cdom 7898  cardccrd 8706  topGenctg 16014  Topctop 20612  TopBasesctb 20615  2nd𝜔c2ndc 21146
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 1841  ax-6 1890  ax-7 1937  ax-8 1994  ax-9 2001  ax-10 2021  ax-11 2036  ax-12 2049  ax-13 2250  ax-ext 2606  ax-rep 4736  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6903  ax-inf2 8483  ax-cc 9202
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 1883  df-eu 2478  df-mo 2479  df-clab 2613  df-cleq 2619  df-clel 2622  df-nfc 2756  df-ne 2797  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3193  df-sbc 3423  df-csb 3520  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-pss 3576  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-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-se 5039  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 5642  df-ord 5688  df-on 5689  df-lim 5690  df-suc 5691  df-iota 5813  df-fun 5852  df-fn 5853  df-f 5854  df-f1 5855  df-fo 5856  df-f1o 5857  df-fv 5858  df-isom 5859  df-riota 6566  df-ov 6608  df-oprab 6609  df-mpt2 6610  df-om 7014  df-1st 7116  df-2nd 7117  df-wrecs 7353  df-recs 7414  df-rdg 7452  df-1o 7506  df-oadd 7510  df-er 7688  df-map 7805  df-en 7901  df-dom 7902  df-sdom 7903  df-fin 7904  df-oi 8360  df-card 8710  df-acn 8713  df-topgen 16020  df-top 20616  df-bases 20617  df-2ndc 21148
This theorem is referenced by: (None)
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