Theorem 19.9v 1286

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-17 973	. 2 |- (ph -> A.xph)
2	1	19.9 1038	1 |- (E.xph <-> ph)

Syntax hints:   <-> wb 146  E.wex 982

This theorem is referenced by:  zfcndext 4984  zfcndpow 4987  ivthlem6 7293  ivthlem7 7294

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-gen 965  ax-17 973  ax-4 975  ax-5o 977  ax-6o 980

This theorem depends on definitions:  df-bi 147  df-ex 983

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