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Theorem basgen 17041
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 17021 . . . 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 17026 . . . 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 3376 . 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 3357 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 936    = wceq 1652    e. wcel 1725    C_ wss 3312   ` cfv 5445   topGenctg 13653   Topctop 16946
This theorem is referenced by:  basgen2  17042
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-13 1727  ax-14 1729  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416  ax-sep 4322  ax-nul 4330  ax-pow 4369  ax-pr 4395  ax-un 4692
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-mo 2285  df-clab 2422  df-cleq 2428  df-clel 2431  df-nfc 2560  df-ne 2600  df-ral 2702  df-rex 2703  df-rab 2706  df-v 2950  df-sbc 3154  df-dif 3315  df-un 3317  df-in 3319  df-ss 3326  df-nul 3621  df-if 3732  df-pw 3793  df-sn 3812  df-pr 3813  df-op 3815  df-uni 4008  df-br 4205  df-opab 4259  df-mpt 4260  df-id 4490  df-xp 4875  df-rel 4876  df-cnv 4877  df-co 4878  df-dm 4879  df-iota 5409  df-fun 5447  df-fv 5453  df-topgen 13655  df-top 16951
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