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# ?Sterm `<> ?Sterm1

Sterm and Sterm1 are disjoint.

?Sterm
  A set term.
?Sterm1
  A set term.

## Description

This constraint states that the set terms Sterm and Sterm1 have to be disjoint. If both terms are known sets, it checks the empty intersection between them. If either Sterm or Sterm1 is a known set, this constraint checks the empty intersection or disjointness and the unconsistent bounds of the set variables involved are modified. If both terms contain set variables, the consistency of the domain bounds is checked and the constraint is delayed. It is activated as soos as the lower bound of one set variable involved is modified.

### Fail Conditions

Fails if Sterm can not be a subset of Sterm1.

### Resatisfiable

No.

## Examples

    [eclipse 3]: S `:: {}.. {1,2,3},S1 `:: {1} .. {1,2,3,4},
                 S `<> S1.

    S = S{{} .. {2, 3}}
    S1 = S1{{1} .. {1, 2, 3, 4}}

    Delayed goals:
            S{{} .. {2, 3}} dis_s S1{{1} .. {1, 2, 3, 4}}
    yes.

## See Also

`:: / 2