TAU-INTERVAL-DOM.html -- ACL2 Version 6.3

### TAU-INTERVAL-DOM

access the domain of a tau interval

    Major Section:  TAU-SYSTEM

It is the case that

    (tau-interval-dom (make-tau-interval dom lo-rel lo hi-rel hi)) = dom

For a well-formed interval, `dom` is one of the symbols `INTEGERP`, `RATIONALP`, `ACL2-NUMBERP`, or `NIL`. When the domain is `NIL` there is no domain restriction.

When the domain is `INTEGERP`, there are additional constraints on the other components. See make-tau-interval.