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?Element `-@ ?SetVariable

Set non-membership constraint
SetVariable
A set variable.
Element
A ground term or a variable.

Description

Constrain SetVariable to not include Element.

If Element is a variable then the constraint is suspended until it becomes ground.

Fail Conditions

Fails if Element must be a member of SetVariable.

Resatisfiable

No.

Examples

?- S `:: []..[a,b], a `-@ S, glb_poss(S,G,P).
G = [], P = [b]

?- S `:: [c]+[a,b], c `-@ S.
no

?- S `:: [a]+[b,c], z `-@ S, glb_poss(S,G,P).
G = [a], P = [b,c]

?- S `:: []..[a,b], X `-@ S, glb_poss(S,G,P).
G = [], P = [a,b]

?- S `:: []..[a,b], X `-@ S, X=b, glb_poss(S,G,P).
G = [], P = [a]

See Also

`@ / 2, in / 2, notin / 2, `:: / 2