Theorem cdeqri 3018

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

Hypothesis

Ref	Expression
cdeqri.1	⊢ CondEq(𝑥 = 𝑦 → 𝜑)

Assertion

Ref	Expression
cdeqri	⊢ (𝑥 = 𝑦 → 𝜑)

Proof of Theorem cdeqri

Step	Hyp	Ref	Expression
1		cdeqri.1	. 2 ⊢ CondEq(𝑥 = 𝑦 → 𝜑)
2		df-cdeq 3016	. 2 ⊢ (CondEq(𝑥 = 𝑦 → 𝜑) ↔ (𝑥 = 𝑦 → 𝜑))
3	1, 2	mpbi 145	1 ⊢ (𝑥 = 𝑦 → 𝜑)

Syntax hints:   → wi 4  CondEqwcdeq 3015

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 3016

This theorem is referenced by:  cdeqnot  3020  cdeqal  3021  cdeqab  3022  cdeqal1  3023  cdeqab1  3024  cdeqim  3025  cdeqeq  3027  cdeqel  3028  nfcdeq  3029