Theorem rexm 3560

Description: Restricted existential quantification implies its restriction is inhabited. (Contributed by Jim Kingdon, 16-Oct-2018.)

Assertion

Ref	Expression
rexm	|- ( E. x e. A ph -> E. x x e. A )

Distinct variable group:   x, A

Allowed substitution hint:   ph( x)

Proof of Theorem rexm

Step	Hyp	Ref	Expression
1		df-rex 2490	. 2 |- ( E. x e. A ph <-> E. x ( x e. A /\ ph ) )
2		simpl 109	. . 3 |- ( ( x e. A /\ ph ) -> x e. A )
3	2	eximi 1623	. 2 |- ( E. x ( x e. A /\ ph ) -> E. x x e. A )
4	1, 3	sylbi 121	1 |- ( E. x e. A ph -> E. x x e. A )

Syntax hints:   -> wi 4   /\ wa 104   E.wex 1515   e. wcel 2176   E.wrex 2485

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-5 1470  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-4 1533  ax-ial 1557

This theorem depends on definitions:  df-bi 117  df-rex 2490

This theorem is referenced by:  elrelimasn  5048  eusvobj2  5930  exmidomni  7244  fodjum  7248  ismgmid  13209  ismnd  13251  dfgrp2e  13360  zrhval  14379