RULE_ASSUM_TAC : ((thm -> thm) -> tactic)
STRUCTURE
SYNOPSIS
Maps an inference rule over the assumptions of a goal.
DESCRIPTION
When applied to an inference rule f and a goal ({A1,...,An} ?- t), the RULE_ASSUM_TAC tactical applies the inference rule to each of the ASSUMEd assumptions to give a new goal.
             {A1,...,An} ?- t
   ====================================  RULE_ASSUM_TAC f
    {f(A1 |- A1),...,f(An |- An)} ?- t

FAILURE
The application of RULE_ASSUM_TAC f to a goal fails iff f fails when applied to any of the assumptions of the goal.
COMMENTS
It does not matter if the goal has no assumptions, but in this case RULE_ASSUM_TAC has no effect.
SEEALSO
HOL  Kananaskis-14