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[parisse]

Last time I checked, octave was *not* a CAS, it's numeric math. maxima is slightly slower than xcas (in my experience most of the time at least 5* slower), you can even test that on a Prime wrt a smartphone: try factor(x^202+x^101+1) for example. And of course the prime UI is much more advanced than the interface of maxima on android. If you don't know maxima, maxima on android is almost unusable, and even if you know maxima, it's not user-friendly.