FIX_TAC : string -> tactic

SYNOPSIS
Fixes universally quantified variables in goal.

DESCRIPTION
Given a string s indicating a sequence of variable names, FIX_TAC s performs the introduction of the indicated variables. It is not required to specify the variables in any particular order. The syntax for the string argument s allows the following patterns:

FAILURE CONDITIONS
Fails if the string specifying the variables is ill-formed or if some of the indicated variables are not present as outer universal quantifiers in the goal.

EXAMPLE
Here we fix just the variable a:
  # g `!x a. a + x = x + a`;;
  # e (FIX_TAC "a");;
  val it : goalstack = 1 subgoal (1 total)

  `!x. a + x = x + a`
while here we rename one of the variables and fix all the others:
  # g `!a b x. a + b + x = (a + b) + x`;;
  #  e (FIX_TAC "[d/x] *");;
  val it : goalstack = 1 subgoal (1 total)

  `a + b + d = (a + b) + d`

SEE ALSO
GEN, GEN_TAC, INTRO_TAC, STRIP_TAC, X_GEN_TAC.