Theorem cdeqri 2971

Description: Property of conditional equality. (Contributed by Mario Carneiro, 11-Aug-2016.)

Hypothesis

Ref	Expression
cdeqri.1	|- CondEq ( x = y -> ph )

Assertion

Ref	Expression
cdeqri	|- ( x = y -> ph )

Proof of Theorem cdeqri

Step	Hyp	Ref	Expression
1		cdeqri.1	. 2 |- CondEq ( x = y -> ph )
2		df-cdeq 2969	. 2 |- (CondEq ( x = y -> ph ) <-> ( x = y -> ph ) )
3	1, 2	mpbi 145	1 |- ( x = y -> ph )

Syntax hints:   -> wi 4  CondEqwcdeq 2968

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106

This theorem depends on definitions:  df-bi 117  df-cdeq 2969

This theorem is referenced by:  cdeqnot  2973  cdeqal  2974  cdeqab  2975  cdeqal1  2976  cdeqab1  2977  cdeqim  2978  cdeqeq  2980  cdeqel  2981  nfcdeq  2982