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Theorem basgen 16720
Description: Given a topology  J, show that a subset  B satisfying the third antecedent is a basis for it. Lemma 2.3 of [Munkres] p. 81 using abbreviations. (Contributed by NM, 22-Jul-2006.) (Revised by Mario Carneiro, 2-Sep-2015.)
Assertion
Ref Expression
basgen  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  B )  =  J )

Proof of Theorem basgen
StepHypRef Expression
1 tgss 16700 . . . 4  |-  ( ( J  e.  Top  /\  B  C_  J )  -> 
( topGen `  B )  C_  ( topGen `  J )
)
213adant3 977 . . 3  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  B )  C_  ( topGen `
 J ) )
3 tgtop 16705 . . . 4  |-  ( J  e.  Top  ->  ( topGen `
 J )  =  J )
433ad2ant1 978 . . 3  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  J )  =  J )
52, 4sseqtrd 3215 . 2  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  B )  C_  J
)
6 simp3 959 . 2  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  J  C_  ( topGen `
 B ) )
75, 6eqssd 3197 1  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  B )  =  J )
Colors of variables: wff set class
Syntax hints:    -> wi 6    /\ w3a 936    = wceq 1624    e. wcel 1685    C_ wss 3153   ` cfv 5221   topGenctg 13336   Topctop 16625
This theorem is referenced by:  basgen2  16721
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10  ax-gen 1534  ax-5 1545  ax-17 1604  ax-9 1637  ax-8 1645  ax-13 1687  ax-14 1689  ax-6 1704  ax-7 1709  ax-11 1716  ax-12 1867  ax-ext 2265  ax-sep 4142  ax-nul 4150  ax-pow 4187  ax-pr 4213  ax-un 4511
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3an 938  df-tru 1312  df-ex 1530  df-nf 1533  df-sb 1632  df-eu 2148  df-mo 2149  df-clab 2271  df-cleq 2277  df-clel 2280  df-nfc 2409  df-ne 2449  df-ral 2549  df-rex 2550  df-rab 2553  df-v 2791  df-sbc 2993  df-dif 3156  df-un 3158  df-in 3160  df-ss 3167  df-nul 3457  df-if 3567  df-pw 3628  df-sn 3647  df-pr 3648  df-op 3650  df-uni 3829  df-br 4025  df-opab 4079  df-mpt 4080  df-id 4308  df-xp 4694  df-rel 4695  df-cnv 4696  df-co 4697  df-dm 4698  df-rn 4699  df-res 4700  df-ima 4701  df-fun 5223  df-fv 5229  df-topgen 13338  df-top 16630
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