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# =>(?BoolExprX, ?BoolExprY, ?Bool)

Bool is the truth value of BoolExprX => BoolExprY being true.
*BoolExprX*
- 0/1-valued expression, such as reified constraint
*BoolExprY*
- 0/1-valued expression, such as reified constraint
*Bool*
- Truth value of the implication

## Description

Equivalent to BX #= BoolExprX, BY #= BoolExprY, Bool #= (BX #=< BY).

If BoolExprX and BoolExprY are constraints that have a corresponding
reified form, Bool reflects the truth of BoolExprX being true implying
that BoolExprY is true.

## See Also

=> / 2, neg / 1, neg / 2, or / 2, or / 3, and / 2, and / 3