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# ?ExprX #= ?ExprY

ExprX is equal to ExprY (with integrality constraints).
*ExprX*
- Integer arithmetic expression
*ExprY*
- Integer arithmetic expression

## Description

Constrains ExprX and ExprY to be equal. Also constrains all variables
appearing in ExprX and ExprY to be integral and checks that all constants
are integers.

Note that if all variables and constants appearing in this constraint
are already integral, then the constraint is equivalent to
ic:(ExprX =:= ExprY).

## See Also

#< / 2, #=< / 2, #>= / 2, #> / 2, #\= / 2, =:= / 2, #= / 3, suspend : #= / 2, gfd : #= / 2, fd : #= / 2