INT_EQ_CONV : conv

SYNOPSIS

Conversion to prove whether one integer literal of type :int is equal to another.

DESCRIPTION

The call INT_EQ_CONV `c1 < c2` where c1 and c2 are integer literals of type :int, returns whichever of |- c1 = c2 <=> T or |- c1 = c2 <=> F is true. By an integer literal we mean either &n or -- &n where n is a numeral.

FAILURE CONDITIONS

Fails if applied to a term that is not an equality comparison on two permitted integer literals of type :int.

EXAMPLE

  # INT_EQ_CONV `&1 = &2`;;
  val it : thm = |- &1 = &2 <=> F

  # INT_EQ_CONV `-- &1 = -- &1`;;
  val it : thm = |- -- &1 = -- &1 <=> T

COMMENTS

The related function REAL_RAT_EQ_CONV subsumes this functionality, also applying to rational literals. Unless the restriction to integers is desired or a tiny efficiency difference matters, it should be used in preference.

SEE ALSO

INT_REDUCE_CONV, REAL_RAT_EQ_CONV.