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Theorem rabsneu 3702
Description: Restricted existential uniqueness determined by a singleton. (Contributed by NM, 29-May-2006.) (Revised by Mario Carneiro, 23-Dec-2016.)
Assertion
Ref Expression
rabsneu  |-  ( ( A  e.  V  /\  { x  e.  B  |  ph }  =  { A } )  ->  E! x  e.  B  ph )

Proof of Theorem rabsneu
StepHypRef Expression
1 df-rab 2552 . . . 4  |-  { x  e.  B  |  ph }  =  { x  |  ( x  e.  B  /\  ph ) }
21eqeq1i 2290 . . 3  |-  ( { x  e.  B  |  ph }  =  { A } 
<->  { x  |  ( x  e.  B  /\  ph ) }  =  { A } )
3 absneu 3701 . . 3  |-  ( ( A  e.  V  /\  { x  |  ( x  e.  B  /\  ph ) }  =  { A } )  ->  E! x ( x  e.  B  /\  ph )
)
42, 3sylan2b 461 . 2  |-  ( ( A  e.  V  /\  { x  e.  B  |  ph }  =  { A } )  ->  E! x ( x  e.  B  /\  ph )
)
5 df-reu 2550 . 2  |-  ( E! x  e.  B  ph  <->  E! x ( x  e.  B  /\  ph )
)
64, 5sylibr 203 1  |-  ( ( A  e.  V  /\  { x  e.  B  |  ph }  =  { A } )  ->  E! x  e.  B  ph )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    = wceq 1623    e. wcel 1684   E!weu 2143   {cab 2269   E!wreu 2545   {crab 2547   {csn 3640
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-reu 2550  df-rab 2552  df-v 2790  df-sn 3646
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