UNDISCH_TAC : term -> tactic

SYNOPSIS
Undischarges an assumption.

DESCRIBE
          A ?- t
   ====================  UNDISCH_TAC v
    A - {v} ?- v ==> t

FAILURE
UNDISCH_TAC will fail if "v" is not an assumption.

COMMENTS
UNDISCHarging v will remove all assumptions which are identical to v, but those which are alpha-equivalent will remain.

SEEALSO  DISCH,   DISCH_ALL,   DISCH_TAC,   DISCH_THEN,   NEG_DISCH,   FILTER_DISCH_TAC,   FILTER_DISCH_THEN,   STRIP_TAC,   UNDISCH,   UNDISCH_ALL

HOL  Kananaskis 0