- STRUCTURE
- SYNOPSIS
- Applies a conversion to both immediate sub-terms of an application. 
- DESCRIPTION
- If t is an application term of the form f x, and c is a
conversion, such that c maps f to |- f = f' and x to
|- x = x', then COMB_CONV c maps t to |- f x = f' x'. 
- FAILURE
- COMB_CONV c t fails if t is not an application term, or if c
fails when applied to the rator and rand of t, or if c is not in
fact a conversion (i.e., a function which maps terms t to a theorem
|- t = t'. 
- SEEALSO