File: DISCH.doc

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\DOC DISCH

\TYPE {DISCH : (term -> thm -> thm)}

\SYNOPSIS
Discharges an assumption.

\KEYWORDS
rule, discharge, assumption, implication.

\DESCRIBE
{
       A |- t
--------------------  DISCH "u"
 A - {{u}} |- u ==> t
}
\FAILURE
{DISCH} will fail if {"u"} is not boolean.

\COMMENTS
The term {"u"} need not be a hypothesis.  Discharging {"u"} will remove all
identical and alpha-equivalent hypotheses.

\SEEALSO
DISCH_ALL, DISCH_TAC, DISCH_THEN, FILTER_DISCH_TAC, FILTER_DISCH_THEN,
NEG_DISCH, STRIP_TAC, UNDISCH, UNDISCH_ALL, UNDISCH_TAC.

\ENDDOC