ISPEC : (term -> thm -> thm)
STRUCTURE
SYNOPSIS
Specializes a theorem, with type instantiation if necessary.
DESCRIPTION
This rule specializes a quantified variable as does SPEC; it differs from it in also instantiating the type if needed:
     A |- !x:ty.tm
  -----------------------  ISPEC "t:ty'"
      A |- tm[t/x]
(where t is free for x in tm, and ty' is an instance of ty).
FAILURE
ISPEC fails if the input theorem is not universally quantified, if the type of the given term is not an instance of the type of the quantified variable, or if the type variable is free in the assumptions.
SEEALSO
HOL  Kananaskis-13