File: DISJ1.doc

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\DOC DISJ1

\TYPE {DISJ1 : thm -> term -> thm}

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

\KEYWORDS
rule, disjunction.

\DESCRIBE
{
       A |- t1
   ---------------  DISJ1 (A |- t1) `t2`
    A |- t1 \/ t2
}
\FAILURE
Fails unless the term argument is boolean.

\EXAMPLE
{
  # DISJ1 TRUTH `F`;;
  val it : thm = |- T \/ F
}

\SEEALSO
DISJ1_TAC, DISJ2, DISJ2_TAC, DISJ_CASES.

\ENDDOC