Theorem moanmo 2080

Description: Nested at-most-one quantifiers. (Contributed by NM, 25-Jan-2006.)

Assertion

Ref	Expression
moanmo	|- E* x ( ph /\ E* x ph )

Proof of Theorem moanmo

Step	Hyp	Ref	Expression
1		id 19	. . 3 |- ( E* x ph -> E* x ph )
2		nfmo1 2015	. . . 4 |- F/ x E* x ph
3	2	moanim 2077	. . 3 |- ( E* x ( E* x ph /\ ph ) <-> ( E* x ph -> E* x ph ) )
4	1, 3	mpbir 145	. 2 |- E* x ( E* x ph /\ ph )
5		ancom 264	. . 3 |- ( ( ph /\ E* x ph ) <-> ( E* x ph /\ ph ) )
6	5	mobii 2040	. 2 |- ( E* x ( ph /\ E* x ph ) <-> E* x ( E* x ph /\ ph ) )
7	4, 6	mpbir 145	1 |- E* x ( ph /\ E* x ph )

Syntax hints:   -> wi 4   /\ wa 103   E*wmo 2004

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 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1481  ax-10 1482  ax-11 1483  ax-i12 1484  ax-bndl 1486  ax-4 1487  ax-17 1503  ax-i9 1507  ax-ial 1511  ax-i5r 1512

This theorem depends on definitions:  df-bi 116  df-tru 1335  df-nf 1438  df-sb 1740  df-eu 2006  df-mo 2007

This theorem is referenced by: (None)