Theorem moan 2149

Description: "At most one" is still the case when a conjunct is added. (Contributed by NM, 22-Apr-1995.)

Assertion

Ref	Expression
moan	|- ( E* x ph -> E* x ( ps /\ ph ) )

Proof of Theorem moan

Step	Hyp	Ref	Expression
1		simpr 110	. 2 |- ( ( ps /\ ph ) -> ph )
2	1	moimi 2145	1 |- ( E* x ph -> E* x ( ps /\ ph ) )

Syntax hints:   -> wi 4   /\ wa 104   E*wmo 2080

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583

This theorem depends on definitions:  df-bi 117  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083

This theorem is referenced by:  moani  2150  mooran1  2152  mormo  2750  rmoan  3006