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Theorem toponss 14700
Description: A member of a topology is a subset of its underlying set. (Contributed by Mario Carneiro, 21-Aug-2015.)
Assertion
Ref Expression
toponss  |-  ( ( J  e.  (TopOn `  X )  /\  A  e.  J )  ->  A  C_  X )

Proof of Theorem toponss
StepHypRef Expression
1 elssuni 3916 . . 3  |-  ( A  e.  J  ->  A  C_ 
U. J )
21adantl 277 . 2  |-  ( ( J  e.  (TopOn `  X )  /\  A  e.  J )  ->  A  C_ 
U. J )
3 toponuni 14689 . . 3  |-  ( J  e.  (TopOn `  X
)  ->  X  =  U. J )
43adantr 276 . 2  |-  ( ( J  e.  (TopOn `  X )  /\  A  e.  J )  ->  X  =  U. J )
52, 4sseqtrrd 3263 1  |-  ( ( J  e.  (TopOn `  X )  /\  A  e.  J )  ->  A  C_  X )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1395    e. wcel 2200    C_ wss 3197   U.cuni 3888   ` cfv 5318  TopOnctopon 14684
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-un 4524
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-rab 2517  df-v 2801  df-sbc 3029  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-opab 4146  df-mpt 4147  df-id 4384  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-iota 5278  df-fun 5320  df-fv 5326  df-topon 14685
This theorem is referenced by:  iscnp3  14877  cnntr  14899  cncnp  14904  tx1cn  14943  tx2cn  14944  txcnp  14945  mopnss  15124  xmettx  15184  dvmptfsum  15399
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