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Theorem isfne4 37255
Description: The predicate "𝐵 is finer than 𝐴 " in terms of the topology generation function. (Contributed by Mario Carneiro, 11-Sep-2015.)
Hypotheses
Ref Expression
isfne.1 𝑋 = ∪ 𝐴
isfne.2 𝑌 = ∪ 𝐵
Assertion
Ref Expression
isfne4 (𝐴Fne𝐵 ↔ (𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)))

Proof of Theorem isfne4
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 fnerel 37253 . . 3 Rel Fne
21brrelex2i 5711 . 2 (𝐴Fne𝐵 → 𝐵 ∈ V)
3 simpl 488 . . . . 5 ((𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)) → 𝑋 = 𝑌)
4 isfne.1 . . . . 5 𝑋 = ∪ 𝐴
5 isfne.2 . . . . 5 𝑌 = ∪ 𝐵
63, 4, 53eqtr3g 2821 . . . 4 ((𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)) → ∪ 𝐴 = ∪ 𝐵)
7 fvex 6906 . . . . . . 7 (topGen‘𝐵) ∈ V
87ssex 5285 . . . . . 6 (𝐴 ⊆ (topGen‘𝐵) → 𝐴 ∈ V)
98adantl 487 . . . . 5 ((𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)) → 𝐴 ∈ V)
109uniexd 7766 . . . 4 ((𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)) → ∪ 𝐴 ∈ V)
116, 10eqeltrrd 2864 . . 3 ((𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)) → ∪ 𝐵 ∈ V)
12 uniexb 7785 . . 3 (𝐵 ∈ V ↔ ∪ 𝐵 ∈ V)
1311, 12sylibr 237 . 2 ((𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)) → 𝐵 ∈ V)
144, 5isfne 37254 . . 3 (𝐵 ∈ V → (𝐴Fne𝐵 ↔ (𝑋 = 𝑌 ∧ ∀𝑥 ∈ 𝐴 𝑥 ⊆ ∪ (𝐵 ∩ 𝒫 𝑥))))
15 dfss3 3901 . . . . 5 (𝐴 ⊆ (topGen‘𝐵) ↔ ∀𝑥 ∈ 𝐴 𝑥 ∈ (topGen‘𝐵))
16 eltg 23287 . . . . . 6 (𝐵 ∈ V → (𝑥 ∈ (topGen‘𝐵) ↔ 𝑥 ⊆ ∪ (𝐵 ∩ 𝒫 𝑥)))
1716ralbidv 3188 . . . . 5 (𝐵 ∈ V → (∀𝑥 ∈ 𝐴 𝑥 ∈ (topGen‘𝐵) ↔ ∀𝑥 ∈ 𝐴 𝑥 ⊆ ∪ (𝐵 ∩ 𝒫 𝑥)))
1815, 17bitrid 286 . . . 4 (𝐵 ∈ V → (𝐴 ⊆ (topGen‘𝐵) ↔ ∀𝑥 ∈ 𝐴 𝑥 ⊆ ∪ (𝐵 ∩ 𝒫 𝑥)))
1918anbi2d 642 . . 3 (𝐵 ∈ V → ((𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)) ↔ (𝑋 = 𝑌 ∧ ∀𝑥 ∈ 𝐴 𝑥 ⊆ ∪ (𝐵 ∩ 𝒫 𝑥))))
2014, 19bitr4d 285 . 2 (𝐵 ∈ V → (𝐴Fne𝐵 ↔ (𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵))))
212, 13, 20pm5.21nii 381 1 (𝐴Fne𝐵 ↔ (𝑋 = 𝑌 ∧ 𝐴 ⊆ (topGen‘𝐵)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ↔ wb 209   ∧ wa 401   = wceq 1569   ∈ wcel 2146  ∀wral 3079  Vcvv 3453   ⊆ wss 3899   ∩ cin 4091  𝒫 cpw 4559  ∪ cuni 4869   class class class wbr 5105  ‘cfv 6546  topGenctg 17620  Fnecfne 37251
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2196  ax-12 2215  ax-ext 2735  ax-sep 5251  ax-nul 5262  ax-pow 5330  ax-pr 5394  ax-un 7758
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2101  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3416  df-v 3455  df-ss 3900  df-dif 4049  df-in 4093  df-un 4153  df-nul 4281  df-if 4485  df-pw 4561  df-sn 4588  df-pr 4590  df-op 4838  df-uni 4870  df-br 5106  df-opab 5170  df-mpt 5189  df-id 5549  df-xp 5660  df-rel 5661  df-cnv 5662  df-co 5663  df-dm 5664  df-iota 6500  df-fun 6548  df-fv 6554  df-topgen 17626  df-fne 37252
This theorem is used by:  isfne4b  37256  isfne2  37257  isfne3  37258  fnebas  37259  fnetg  37260  topfne  37269  fnemeet1  37281  fnemeet2  37282  fnejoin1  37283  fnejoin2  37284
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