TAU-INTERVAL-LO-REL.html -- ACL2 Version 6.3

### TAU-INTERVAL-LO-REL

access the lower bound relation of a tau interval

    Major Section:  TAU-SYSTEM

It is the case that

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

For a well-formed interval, `lo-rel` is a Boolean, where `t` denotes the `<` (strong inequality or ``less-than'') relation and `nil` denotes `<=` (weak inequality or ``less-than-or-equal'') relation between the lower bound and the elements of the interval.

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