Theorem oveqd

Description: Equality deduction for operation value. (Contributed by NM, 9-Sep-2006)

	Ref	Expression
Hypothesis	oveq1d.1	$$⊢\phi \to A=B$$
Assertion	oveqd	$$⊢\phi \to CAD=CBD$$

Proof

Step	Hyp	Ref	Expression
1		oveq1d.1	$$⊢\phi \to A=B$$
2		oveq	$$⊢A=B\to CAD=CBD$$
3	1 2	syl	$$⊢\phi \to CAD=CBD$$