Theorem oveq123i

Description: Equality inference for operation value. (Contributed by FL, 11-Jul-2010)

	Ref	Expression
Hypotheses	oveq123i.1	|- A = C
	oveq123i.2	|- B = D
	oveq123i.3	|- F = G
Assertion	oveq123i	|- ( A F B ) = ( C G D )

Proof

Step	Hyp	Ref	Expression
1		oveq123i.1	|- A = C
2		oveq123i.2	|- B = D
3		oveq123i.3	|- F = G
4	1 2	oveq12i	|- ( A F B ) = ( C F D )
5	3	oveqi	|- ( C F D ) = ( C G D )
6	4 5	eqtri	|- ( A F B ) = ( C G D )