(%i1) assume(e>0,e<1);
(%o1) [e > 0, e < 1]
The following is OK:
(%i4) is(e^2<1);
(%o4) true
BUT the following is not OK:
(%i5) is(e^2<2);
(%o5) unknown
If it knows that e^2 is less than 1 then it should also know that e^2 is less than 2 (or any other number larger than 1) but it does not.
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Though it's true that it would be nice if Maxima could determine that e^2<2, this is not an "incorrect result"; "unknown" means that Maxima cannot tell whether the relation is true.
So I have reclassified this as a feature request -- that is, a request that Maxima do a better job.
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Attempted to make title more descriptive.