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Theorem reusv1 4715
Description: Two ways to express single-valuedness of a class expression  C ( y ). (Contributed by NM, 16-Dec-2012.) (Proof shortened by Mario Carneiro, 18-Nov-2016.)
Assertion
Ref Expression
reusv1  |-  ( E. y  e.  B  ph  ->  ( E! x  e.  A  A. y  e.  B  ( ph  ->  x  =  C )  <->  E. x  e.  A  A. y  e.  B  ( ph  ->  x  =  C ) ) )
Distinct variable groups:    x, A    x, B    x, C    ph, x    x, y
Allowed substitution hints:    ph( y)    A( y)    B( y)    C( y)

Proof of Theorem reusv1
StepHypRef Expression
1 nfra1 2748 . . . 4  |-  F/ y A. y  e.  B  ( ph  ->  x  =  C )
21nfmo 2297 . . 3  |-  F/ y E* x A. y  e.  B  ( ph  ->  x  =  C )
3 rsp 2758 . . . . . . . 8  |-  ( A. y  e.  B  ( ph  ->  x  =  C )  ->  ( y  e.  B  ->  ( ph  ->  x  =  C ) ) )
43imp3a 421 . . . . . . 7  |-  ( A. y  e.  B  ( ph  ->  x  =  C )  ->  ( (
y  e.  B  /\  ph )  ->  x  =  C ) )
54com12 29 . . . . . 6  |-  ( ( y  e.  B  /\  ph )  ->  ( A. y  e.  B  ( ph  ->  x  =  C )  ->  x  =  C ) )
65alrimiv 1641 . . . . 5  |-  ( ( y  e.  B  /\  ph )  ->  A. x
( A. y  e.  B  ( ph  ->  x  =  C )  ->  x  =  C )
)
7 moeq 3102 . . . . 5  |-  E* x  x  =  C
8 moim 2326 . . . . 5  |-  ( A. x ( A. y  e.  B  ( ph  ->  x  =  C )  ->  x  =  C )  ->  ( E* x  x  =  C  ->  E* x A. y  e.  B  ( ph  ->  x  =  C ) ) )
96, 7, 8ee10 1385 . . . 4  |-  ( ( y  e.  B  /\  ph )  ->  E* x A. y  e.  B  ( ph  ->  x  =  C ) )
109ex 424 . . 3  |-  ( y  e.  B  ->  ( ph  ->  E* x A. y  e.  B  ( ph  ->  x  =  C ) ) )
112, 10rexlimi 2815 . 2  |-  ( E. y  e.  B  ph  ->  E* x A. y  e.  B  ( ph  ->  x  =  C ) )
12 mormo 2912 . 2  |-  ( E* x A. y  e.  B  ( ph  ->  x  =  C )  ->  E* x  e.  A A. y  e.  B  ( ph  ->  x  =  C ) )
13 reu5 2913 . . 3  |-  ( E! x  e.  A  A. y  e.  B  ( ph  ->  x  =  C )  <->  ( E. x  e.  A  A. y  e.  B  ( ph  ->  x  =  C )  /\  E* x  e.  A A. y  e.  B  ( ph  ->  x  =  C ) ) )
1413rbaib 874 . 2  |-  ( E* x  e.  A A. y  e.  B  ( ph  ->  x  =  C )  ->  ( E! x  e.  A  A. y  e.  B  ( ph  ->  x  =  C )  <->  E. x  e.  A  A. y  e.  B  ( ph  ->  x  =  C ) ) )
1511, 12, 143syl 19 1  |-  ( E. y  e.  B  ph  ->  ( E! x  e.  A  A. y  e.  B  ( ph  ->  x  =  C )  <->  E. x  e.  A  A. y  e.  B  ( ph  ->  x  =  C ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 177    /\ wa 359   A.wal 1549    = wceq 1652    e. wcel 1725   E*wmo 2281   A.wral 2697   E.wrex 2698   E!wreu 2699   E*wrmo 2700
This theorem is referenced by:  reusv5OLD  4725  cdleme25c  31053  cdleme29c  31074  cdlemefrs29cpre1  31096  cdlemk29-3  31609  cdlemkid5  31633  dihlsscpre  31933  mapdh9a  32489  mapdh9aOLDN  32490
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-mo 2285  df-clab 2422  df-cleq 2428  df-clel 2431  df-ral 2702  df-rex 2703  df-reu 2704  df-rmo 2705  df-v 2950
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