Description: Equality deduction for operation value. (Contributed by NM, 9Sep2006)
Ref  Expression  

Hypothesis  oveq1d.1   ( ph > A = B ) 

Assertion  oveqd   ( ph > ( C A D ) = ( C B D ) ) 
Step  Hyp  Ref  Expression 

1  oveq1d.1   ( ph > A = B ) 

2  oveq   ( A = B > ( C A D ) = ( C B D ) ) 

3  1 2  syl   ( ph > ( C A D ) = ( C B D ) ) 