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Theorem isfne4 33745
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 = 𝑌𝐴 ⊆ (topGen‘𝐵)))

Proof of Theorem isfne4
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 fnerel 33743 . . 3 Rel Fne
21brrelex2i 5596 . 2 (𝐴Fne𝐵𝐵 ∈ V)
3 simpl 486 . . . . 5 ((𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵)) → 𝑋 = 𝑌)
4 isfne.1 . . . . 5 𝑋 = 𝐴
5 isfne.2 . . . . 5 𝑌 = 𝐵
63, 4, 53eqtr3g 2882 . . . 4 ((𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵)) → 𝐴 = 𝐵)
7 fvex 6674 . . . . . . 7 (topGen‘𝐵) ∈ V
87ssex 5211 . . . . . 6 (𝐴 ⊆ (topGen‘𝐵) → 𝐴 ∈ V)
98adantl 485 . . . . 5 ((𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵)) → 𝐴 ∈ V)
109uniexd 7462 . . . 4 ((𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵)) → 𝐴 ∈ V)
116, 10eqeltrrd 2917 . . 3 ((𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵)) → 𝐵 ∈ V)
12 uniexb 7480 . . 3 (𝐵 ∈ V ↔ 𝐵 ∈ V)
1311, 12sylibr 237 . 2 ((𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵)) → 𝐵 ∈ V)
144, 5isfne 33744 . . 3 (𝐵 ∈ V → (𝐴Fne𝐵 ↔ (𝑋 = 𝑌 ∧ ∀𝑥𝐴 𝑥 (𝐵 ∩ 𝒫 𝑥))))
15 dfss3 3941 . . . . 5 (𝐴 ⊆ (topGen‘𝐵) ↔ ∀𝑥𝐴 𝑥 ∈ (topGen‘𝐵))
16 eltg 21565 . . . . . 6 (𝐵 ∈ V → (𝑥 ∈ (topGen‘𝐵) ↔ 𝑥 (𝐵 ∩ 𝒫 𝑥)))
1716ralbidv 3192 . . . . 5 (𝐵 ∈ V → (∀𝑥𝐴 𝑥 ∈ (topGen‘𝐵) ↔ ∀𝑥𝐴 𝑥 (𝐵 ∩ 𝒫 𝑥)))
1815, 17syl5bb 286 . . . 4 (𝐵 ∈ V → (𝐴 ⊆ (topGen‘𝐵) ↔ ∀𝑥𝐴 𝑥 (𝐵 ∩ 𝒫 𝑥)))
1918anbi2d 631 . . 3 (𝐵 ∈ V → ((𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵)) ↔ (𝑋 = 𝑌 ∧ ∀𝑥𝐴 𝑥 (𝐵 ∩ 𝒫 𝑥))))
2014, 19bitr4d 285 . 2 (𝐵 ∈ V → (𝐴Fne𝐵 ↔ (𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵))))
212, 13, 20pm5.21nii 383 1 (𝐴Fne𝐵 ↔ (𝑋 = 𝑌𝐴 ⊆ (topGen‘𝐵)))
Colors of variables: wff setvar class
Syntax hints:  wb 209  wa 399   = wceq 1538  wcel 2115  wral 3133  Vcvv 3480  cin 3918  wss 3919  𝒫 cpw 4522   cuni 4824   class class class wbr 5052  cfv 6343  topGenctg 16711  Fnecfne 33741
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-sep 5189  ax-nul 5196  ax-pow 5253  ax-pr 5317  ax-un 7455
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ral 3138  df-rex 3139  df-rab 3142  df-v 3482  df-sbc 3759  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-nul 4277  df-if 4451  df-pw 4524  df-sn 4551  df-pr 4553  df-op 4557  df-uni 4825  df-br 5053  df-opab 5115  df-mpt 5133  df-id 5447  df-xp 5548  df-rel 5549  df-cnv 5550  df-co 5551  df-dm 5552  df-iota 6302  df-fun 6345  df-fv 6351  df-topgen 16717  df-fne 33742
This theorem is referenced by:  isfne4b  33746  isfne2  33747  isfne3  33748  fnebas  33749  fnetg  33750  topfne  33759  fnemeet1  33771  fnemeet2  33772  fnejoin1  33773  fnejoin2  33774
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