Theorem mooran1 2126

Description: "At most one" imports disjunction to conjunction. (Contributed by NM, 5-Apr-2004.) (Proof shortened by Andrew Salmon, 9-Jul-2011.)

Assertion

Ref	Expression
mooran1	|- ( ( E* x ph \/ E* x ps ) -> E* x ( ph /\ ps ) )

Proof of Theorem mooran1

Step	Hyp	Ref	Expression
1		simpl 109	. . 3 |- ( ( ph /\ ps ) -> ph )
2	1	moimi 2119	. 2 |- ( E* x ph -> E* x ( ph /\ ps ) )
3		moan 2123	. 2 |- ( E* x ps -> E* x ( ph /\ ps ) )
4	2, 3	jaoi 718	1 |- ( ( E* x ph \/ E* x ps ) -> E* x ( ph /\ ps ) )

Syntax hints:   -> wi 4   /\ wa 104   \/ wo 710   E*wmo 2055

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 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558

This theorem depends on definitions:  df-bi 117  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058

This theorem is referenced by: (None)