File: EQF_INTRO.doc

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\DOC EQF_INTRO

\TYPE {EQF_INTRO : thm -> thm}

\SYNOPSIS
Converts negation to equality with {F}.

\KEYWORDS
rule, negation, falsity.

\DESCRIBE
{
     A |- ~tm
   ---------------  EQF_INTRO
    A |- tm <=> F
}

\FAILURE
Fails if the argument theorem is not a negation.

\EXAMPLE
{
  # let th = ASSUME `~p`;;
  val th : thm = ~p |- ~p

  # EQF_INTRO th;;
  val it : thm = ~p |- p <=> F
}

\SEEALSO
EQF_ELIM, EQT_ELIM, EQT_INTRO, NOT_ELIM, NOT_INTRO.

\ENDDOC