File: REFL.doc

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\DOC REFL

\TYPE {REFL : term -> thm}

\SYNOPSIS
Returns theorem expressing reflexivity of equality.

\KEYWORDS
rule, reflexive, equality.

\DESCRIBE
{REFL} maps any term {`t`} to the corresponding theorem {|- t = t}.

\FAILURE
Never fails.

\EXAMPLE
{
  # REFL `2`;;
  val it : thm = |- 2 = 2
  
  # REFL `p:bool`;;
  val it : thm = |- p <=> p
}

\COMMENTS
This is one of HOL Light's 10 primitive inference rules.

\SEEALSO
ALL_CONV, REFL_TAC.

\ENDDOC