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Theorem rspcedeq2vd 2844
Description: Restricted existential specialization, using implicit substitution. Variant of rspcedvd 2840 for equations, in which the right hand side depends on the quantified variable. (Contributed by AV, 24-Dec-2019.)
Hypotheses
Ref Expression
rspcedeqvd.1  |-  ( ph  ->  A  e.  B )
rspcedeqvd.2  |-  ( (
ph  /\  x  =  A )  ->  C  =  D )
Assertion
Ref Expression
rspcedeq2vd  |-  ( ph  ->  E. x  e.  B  C  =  D )
Distinct variable groups:    x, A    x, B    ph, x    x, C
Allowed substitution hint:    D( x)

Proof of Theorem rspcedeq2vd
StepHypRef Expression
1 rspcedeqvd.1 . 2  |-  ( ph  ->  A  e.  B )
2 rspcedeqvd.2 . . . 4  |-  ( (
ph  /\  x  =  A )  ->  C  =  D )
32eqcomd 2176 . . 3  |-  ( (
ph  /\  x  =  A )  ->  D  =  C )
43eqeq2d 2182 . 2  |-  ( (
ph  /\  x  =  A )  ->  ( C  =  D  <->  C  =  C ) )
5 eqidd 2171 . 2  |-  ( ph  ->  C  =  C )
61, 4, 5rspcedvd 2840 1  |-  ( ph  ->  E. x  e.  B  C  =  D )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    = wceq 1348    e. wcel 2141   E.wrex 2449
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 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152
This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-rex 2454  df-v 2732
This theorem is referenced by: (None)
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