Theorem moor 1048

Description: "At most one" is still the case when a disjunct is removed.

Assertion

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

Proof of Theorem moor

Step	Hyp	Ref	Expression
1		immo 1043	. 2 |- (A.x(ph -> (ph \/ ps)) -> (E*x(ph \/ ps) -> E*xph))
2		orc 225	. 2 |- (ph -> (ph \/ ps))
3	1, 2	mpg 684	1 |- (E*x(ph \/ ps) -> E*xph)

Syntax hints:   -> wi 2   \/ wo 195  E*wmo 1008

This theorem is referenced by:  mooran2 1050

This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-16 922  ax-17 925

This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010

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