GEN_SIMPLIFY_CONV : strategy -> simpset -> int -> thm list -> conv
SYNOPSIS
General simplification with given strategy and simpset and theorems.
DESCRIPTION
The call GEN_SIMPLIFY_CONV strat ss n thl incorporates the rewrites and
conditional rewrites derived from thl into the simpset ss, then simplifies
using that simpset, controlling the traversal of the term by strat, and
starting at level n.