Theorem exdistr2 969

Description: Distribution of existential quantifiers.

Assertion

Ref	Expression
exdistr2	|- (E.xE.yE.z(ph /\ ps) <-> E.x(ph /\ E.yE.zps))

Distinct variable group(s):   ph,y   ph,z

Proof of Theorem exdistr2

Step	Hyp	Ref	Expression
1		19.42vv 968	. 2 |- (E.yE.z(ph /\ ps) <-> (ph /\ E.yE.zps))
2	1	biex 733	1 |- (E.xE.yE.z(ph /\ ps) <-> E.x(ph /\ E.yE.zps))

Syntax hints:   <-> wb 127   /\ wa 196  E.wex 678

This theorem is referenced by:  opabid 2099

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-gen 677  ax-17 925

This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679

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