Theorem reurmo 2764

Description: Restricted existential uniqueness implies restricted "at most one." (Contributed by NM, 16-Jun-2017.)

Assertion

Ref	Expression
reurmo	|- ( E! x e. A ph -> E* x e. A ph )

Proof of Theorem reurmo

Step	Hyp	Ref	Expression
1		reu5 2762	. 2 |- ( E! x e. A ph <-> ( E. x e. A ph /\ E* x e. A ph ) )
2	1	simprbi 275	1 |- ( E! x e. A ph -> E* x e. A ph )

Syntax hints:   -> wi 4   E.wrex 2521   E!wreu 2522   E*wrmo 2523

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584

This theorem depends on definitions:  df-bi 117  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-rex 2526  df-reu 2527  df-rmo 2528

This theorem is referenced by: (None)