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Theorem distopon 14592
Description: The discrete topology on a set  A, with base set. (Contributed by Mario Carneiro, 13-Aug-2015.)
Assertion
Ref Expression
distopon  |-  ( A  e.  V  ->  ~P A  e.  (TopOn `  A
) )

Proof of Theorem distopon
StepHypRef Expression
1 distop 14590 . 2  |-  ( A  e.  V  ->  ~P A  e.  Top )
2 unipw 4262 . . . 4  |-  U. ~P A  =  A
32eqcomi 2209 . . 3  |-  A  = 
U. ~P A
43a1i 9 . 2  |-  ( A  e.  V  ->  A  =  U. ~P A )
5 istopon 14518 . 2  |-  ( ~P A  e.  (TopOn `  A )  <->  ( ~P A  e.  Top  /\  A  =  U. ~P A ) )
61, 4, 5sylanbrc 417 1  |-  ( A  e.  V  ->  ~P A  e.  (TopOn `  A
) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1373    e. wcel 2176   ~Pcpw 3616   U.cuni 3850   ` cfv 5272   Topctop 14502  TopOnctopon 14515
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 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-13 2178  ax-14 2179  ax-ext 2187  ax-sep 4163  ax-pow 4219  ax-pr 4254  ax-un 4481
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ral 2489  df-rex 2490  df-rab 2493  df-v 2774  df-sbc 2999  df-un 3170  df-in 3172  df-ss 3179  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-br 4046  df-opab 4107  df-mpt 4108  df-id 4341  df-xp 4682  df-rel 4683  df-cnv 4684  df-co 4685  df-dm 4686  df-iota 5233  df-fun 5274  df-fv 5280  df-top 14503  df-topon 14516
This theorem is referenced by:  sn0topon  14593  cndis  14746  txdis1cn  14783
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