Theorem cdeqri 3421

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 3419	. 2 |- (CondEq ( x = y -> ph ) <-> ( x = y -> ph ) )
3	1, 2	mpbi 220	1 |- ( x = y -> ph )

Syntax hints:   -> wi 4  CondEqwcdeq 3418

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 197  df-cdeq 3419

This theorem is referenced by:  cdeqnot  3423  cdeqal  3424  cdeqab  3425  cdeqal1  3426  cdeqab1  3427  cdeqim  3428  cdeqeq  3430  cdeqel  3431  nfcdeq  3432  bj-cdeqab  32787