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# ?X #<= ?Y

The linear term X is less than or equal to the linear term Y.
*?X*
- A linear term.
*?Y*
- A linear term.

## Description

This constraint states that the linear term X is less than or equal to
the linear term Y. It is activated whenever the maximum or minimum of a
domain variable is updated that might require updating other domains.
When propagating domain updates, the system takes into account only
maximum and minimum values of the whole domain and makes sure that these
values are consistent with those of other domain variables.
If one of the arguments is a non-linear polynomial, this predicate
delays until it becomes linear.

### Fail Conditions

Fails if X is greater than Y.
### Resatisfiable

No.
## See Also

#> / 2, #< / 2, #>= / 2, #= / 2, ## / 2