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Theorem 2basgeng 14598
Description: Conditions that determine the equality of two generated topologies. (Contributed by NM, 8-May-2007.) (Revised by Jim Kingdon, 5-Mar-2023.)
Assertion
Ref Expression
2basgeng ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) = (topGen‘𝐶))

Proof of Theorem 2basgeng
StepHypRef Expression
1 tgvalex 13139 . . . . 5 (𝐵𝑉 → (topGen‘𝐵) ∈ V)
213ad2ant1 1021 . . . 4 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) ∈ V)
3 simp3 1002 . . . 4 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → 𝐶 ⊆ (topGen‘𝐵))
42, 3ssexd 4188 . . 3 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → 𝐶 ∈ V)
5 simp2 1001 . . 3 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → 𝐵𝐶)
6 tgss 14579 . . 3 ((𝐶 ∈ V ∧ 𝐵𝐶) → (topGen‘𝐵) ⊆ (topGen‘𝐶))
74, 5, 6syl2anc 411 . 2 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) ⊆ (topGen‘𝐶))
8 simp1 1000 . . . 4 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → 𝐵𝑉)
9 tgss3 14594 . . . 4 ((𝐶 ∈ V ∧ 𝐵𝑉) → ((topGen‘𝐶) ⊆ (topGen‘𝐵) ↔ 𝐶 ⊆ (topGen‘𝐵)))
104, 8, 9syl2anc 411 . . 3 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → ((topGen‘𝐶) ⊆ (topGen‘𝐵) ↔ 𝐶 ⊆ (topGen‘𝐵)))
113, 10mpbird 167 . 2 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐶) ⊆ (topGen‘𝐵))
127, 11eqssd 3211 1 ((𝐵𝑉𝐵𝐶𝐶 ⊆ (topGen‘𝐵)) → (topGen‘𝐵) = (topGen‘𝐶))
Colors of variables: wff set class
Syntax hints:  wi 4  wb 105  w3a 981   = wceq 1373  wcel 2177  Vcvv 2773  wss 3167  cfv 5276  topGenctg 13130
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2179  ax-14 2180  ax-ext 2188  ax-sep 4166  ax-pow 4222  ax-pr 4257  ax-un 4484
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ral 2490  df-rex 2491  df-v 2775  df-sbc 3000  df-un 3171  df-in 3173  df-ss 3180  df-pw 3619  df-sn 3640  df-pr 3641  df-op 3643  df-uni 3853  df-iun 3931  df-br 4048  df-opab 4110  df-mpt 4111  df-id 4344  df-xp 4685  df-rel 4686  df-cnv 4687  df-co 4688  df-dm 4689  df-iota 5237  df-fun 5278  df-fv 5284  df-topgen 13136
This theorem is referenced by:  txbasval  14783  tgioo  15070  tgqioo  15071
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