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Theorem ralsng 3707
Description: Substitution expressed in terms of quantification over a singleton. (Contributed by NM, 14-Dec-2005.) (Revised by Mario Carneiro, 23-Apr-2015.)
Hypothesis
Ref Expression
ralsng.1  |-  ( x  =  A  ->  ( ph 
<->  ps ) )
Assertion
Ref Expression
ralsng  |-  ( A  e.  V  ->  ( A. x  e.  { A } ph  <->  ps ) )
Distinct variable groups:    x, A    ps, x
Allowed substitution hints:    ph( x)    V( x)

Proof of Theorem ralsng
StepHypRef Expression
1 ralsns 3705 . 2  |-  ( A  e.  V  ->  ( A. x  e.  { A } ph  <->  [. A  /  x ]. ph ) )
2 ralsng.1 . . 3  |-  ( x  =  A  ->  ( ph 
<->  ps ) )
32sbcieg 3062 . 2  |-  ( A  e.  V  ->  ( [. A  /  x ]. ph  <->  ps ) )
41, 3bitrd 188 1  |-  ( A  e.  V  ->  ( A. x  e.  { A } ph  <->  ps ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105    = wceq 1395    e. wcel 2200   A.wral 2508   [.wsbc 3029   {csn 3667
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-ext 2211
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-v 2802  df-sbc 3030  df-sn 3673
This theorem is referenced by:  ralsn  3710  ralprg  3718  raltpg  3720  ralunsn  3879  iinxsng  4042  posng  4796  fimax2gtrilemstep  7083  iseqf1olemqk  10759  seq3f1olemstep  10766  fimaxre2  11778  mgm1  13443  sgrp1  13484  mnd1  13528  grp1  13679  0subg  13776  ring1  14062  2sqlem10  15844  usgr1e  16080  1hevtxdg0fi  16113  nninfsellemdc  16548
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