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# glb(?S, ?Glb)

S is a set domain variable and Glb is the lower bound of its domain.
*?S*
- A set domain variable.
*?Glb*
- A free variable or a ground set.

## Description

Glb is the ground set corresponding to the lower bound of the domain of
S. If Glb is a free variable, it is instanciated to the lower bound of
the domain of S. If it is a ground set, it should be equal to the lower
bound of the domain of S, otherwise it fails.

### Fail Conditions

Fails if S is not a set domain variable or if Glb is a ground set not
equal to the lower bound of S domain.
### Resatisfiable

No.
## Examples

[eclipse 9]: S `:: {}.. {1,2,3,5}, glb(S,Glb).
S = S{{} .. {1, 2, 3}}
Glb = {}
yes.

## See Also

`:: / 2, lub / 2, set_range / 3