Can someone comment on whether it makes sense to think of ConditionSet and AppliedPredicate as being instances of Boolean? Or does it make more sense to think, for example, of ConditionSet as a function that returns a Boolean result? In the work that I am doing on Piecewise, Relational and BooleanFunction, it has struck me as odd to have to deal with these in some of the same ways that I would have to deal with And, Or and Not. What features do we gain that are useful by subclassing from Boolean?
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