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Theorem basgen 13240
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 13223 . . . 4  |-  ( ( J  e.  Top  /\  B  C_  J )  -> 
( topGen `  B )  C_  ( topGen `  J )
)
213adant3 1017 . . 3  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  B )  C_  ( topGen `
 J ) )
3 tgtop 13228 . . . 4  |-  ( J  e.  Top  ->  ( topGen `
 J )  =  J )
433ad2ant1 1018 . . 3  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  J )  =  J )
52, 4sseqtrd 3193 . 2  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  B )  C_  J
)
6 simp3 999 . 2  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  J  C_  ( topGen `
 B ) )
75, 6eqssd 3172 1  |-  ( ( J  e.  Top  /\  B  C_  J  /\  J  C_  ( topGen `  B )
)  ->  ( topGen `  B )  =  J )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 978    = wceq 1353    e. wcel 2148    C_ wss 3129   ` cfv 5212   topGenctg 12648   Topctop 13155
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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4118  ax-pow 4171  ax-pr 4206  ax-un 4430
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2739  df-sbc 2963  df-un 3133  df-in 3135  df-ss 3142  df-pw 3576  df-sn 3597  df-pr 3598  df-op 3600  df-uni 3808  df-br 4001  df-opab 4062  df-mpt 4063  df-id 4290  df-xp 4629  df-rel 4630  df-cnv 4631  df-co 4632  df-dm 4633  df-iota 5174  df-fun 5214  df-fv 5220  df-topgen 12654  df-top 13156
This theorem is referenced by:  basgen2  13241
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