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Theorem indistop 16755
Description: The indiscrete topology on a set  A. Part of Example 2 in [Munkres] p. 77. (Contributed by FL, 16-Jul-2006.) (Revised by Stefan Allan, 6-Nov-2008.) (Revised by Mario Carneiro, 13-Aug-2015.)
Assertion
Ref Expression
indistop  |-  { (/) ,  A }  e.  Top

Proof of Theorem indistop
StepHypRef Expression
1 indislem 16753 . 2  |-  { (/) ,  (  _I  `  A
) }  =  { (/)
,  A }
2 fvex 5555 . . . 4  |-  (  _I 
`  A )  e. 
_V
3 indistopon 16754 . . . 4  |-  ( (  _I  `  A )  e.  _V  ->  { (/) ,  (  _I  `  A
) }  e.  (TopOn `  (  _I  `  A
) ) )
42, 3ax-mp 8 . . 3  |-  { (/) ,  (  _I  `  A
) }  e.  (TopOn `  (  _I  `  A
) )
54topontopi 16685 . 2  |-  { (/) ,  (  _I  `  A
) }  e.  Top
61, 5eqeltrri 2367 1  |-  { (/) ,  A }  e.  Top
Colors of variables: wff set class
Syntax hints:    e. wcel 1696   _Vcvv 2801   (/)c0 3468   {cpr 3654    _I cid 4320   ` cfv 5271   Topctop 16647  TopOnctopon 16648
This theorem is referenced by:  indistpsx  16763  indistps  16764  indistps2  16765  indiscld  16844  indiscon  17160  txindis  17344  indispcon  23780  onpsstopbas  24941  indcomp  25692
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-ral 2561  df-rex 2562  df-rab 2565  df-v 2803  df-sbc 3005  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-op 3662  df-uni 3844  df-br 4040  df-opab 4094  df-mpt 4095  df-id 4325  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-iota 5235  df-fun 5273  df-fv 5279  df-top 16652  df-topon 16655
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