File: DISJ2.doc

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\DOC DISJ2

\TYPE {DISJ2 : term -> thm -> thm}

\SYNOPSIS
Introduces a left disjunct into the conclusion of a theorem.

\KEYWORDS
rule, disjunction.

\DESCRIBE
{
      A |- t2
   ---------------  DISJ2 `t1`
    A |- t1 \/ t2
}
\FAILURE
Fails if the term argument is not boolean.

\EXAMPLE
{
  # DISJ2 `F` TRUTH;;
  val it : thm = |- F \/ T
}

\SEEALSO
DISJ1, DISJ1_TAC, DISJ2_TAC, DISJ_CASES.

\ENDDOC