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Theorem rspc2ev 2844
Description: 2-variable restricted existential specialization, using implicit substitution. (Contributed by NM, 16-Oct-1999.)
Hypotheses
Ref Expression
rspc2v.1  |-  ( x  =  A  ->  ( ph 
<->  ch ) )
rspc2v.2  |-  ( y  =  B  ->  ( ch 
<->  ps ) )
Assertion
Ref Expression
rspc2ev  |-  ( ( A  e.  C  /\  B  e.  D  /\  ps )  ->  E. x  e.  C  E. y  e.  D  ph )
Distinct variable groups:    x, y, A   
y, B    x, C    x, D, y    ch, x    ps, y
Allowed substitution hints:    ph( x, y)    ps( x)    ch( y)    B( x)    C( y)

Proof of Theorem rspc2ev
StepHypRef Expression
1 rspc2v.2 . . . . 5  |-  ( y  =  B  ->  ( ch 
<->  ps ) )
21rspcev 2829 . . . 4  |-  ( ( B  e.  D  /\  ps )  ->  E. y  e.  D  ch )
32anim2i 340 . . 3  |-  ( ( A  e.  C  /\  ( B  e.  D  /\  ps ) )  -> 
( A  e.  C  /\  E. y  e.  D  ch ) )
433impb 1189 . 2  |-  ( ( A  e.  C  /\  B  e.  D  /\  ps )  ->  ( A  e.  C  /\  E. y  e.  D  ch ) )
5 rspc2v.1 . . . 4  |-  ( x  =  A  ->  ( ph 
<->  ch ) )
65rexbidv 2466 . . 3  |-  ( x  =  A  ->  ( E. y  e.  D  ph  <->  E. y  e.  D  ch ) )
76rspcev 2829 . 2  |-  ( ( A  e.  C  /\  E. y  e.  D  ch )  ->  E. x  e.  C  E. y  e.  D  ph )
84, 7syl 14 1  |-  ( ( A  e.  C  /\  B  e.  D  /\  ps )  ->  E. x  e.  C  E. y  e.  D  ph )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    /\ w3a 968    = wceq 1343    e. wcel 2136   E.wrex 2444
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2296  df-rex 2449  df-v 2727
This theorem is referenced by:  rspc3ev  2846  opelxp  4633  rspceov  5880  2dom  6767  apreim  8497  addcn2  11247  mulcn2  11249  divalglemnn  11851  bezoutlema  11928  bezoutlemb  11929  pythagtriplem18  12209  pczpre  12225  pcdiv  12230  4sqlem3  12316  4sqlem4  12318  txuni2  12856  txopn  12865  txdis  12877  txdis1cn  12878  xmettxlem  13109  2irrexpq  13494  2irrexpqap  13496  2sqlem2  13551  2sqlem8  13559
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