Theorem 19.9v 1279

Description: Special case of Theorem 19.9 of [Margaris] p. 89.

Assertion

Ref	Expression
19.9v	|- (E.xph <-> ph)

Distinct variable group:   ph,x

Proof of Theorem 19.9v

Step	Hyp	Ref	Expression
1		ax-17 968	. 2 |- (ph -> A.xph)
2	1	19.9 1032	1 |- (E.xph <-> ph)

Syntax hints:   <-> wb 146  E.wex 977

This theorem is referenced by:  zfcndext 4937  zfcndpow 4940  ivthlem6 7221  ivthlem7 7222  ivthlem6OLD 7230  ivthlem7OLD 7231

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-gen 960  ax-17 968  ax-4 970  ax-5o 972  ax-6o 975

This theorem depends on definitions:  df-bi 147  df-ex 978

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