Theorem cdeqri 2899

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 2897	. 2 ⊢ (CondEq(𝑥 = 𝑦 → 𝜑) ↔ (𝑥 = 𝑦 → 𝜑))
3	1, 2	mpbi 144	1 ⊢ (𝑥 = 𝑦 → 𝜑)

Syntax hints:   → wi 4  CondEqwcdeq 2896

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105

This theorem depends on definitions:  df-bi 116  df-cdeq 2897

This theorem is referenced by:  cdeqnot  2901  cdeqal  2902  cdeqab  2903  cdeqal1  2904  cdeqab1  2905  cdeqim  2906  cdeqeq  2908  cdeqel  2909  nfcdeq  2910