Polynomial derivative causes Prime to Crash?
07-14-2016, 05:15 AM
Post: #7
 parisse Senior Member Posts: 1,313 Joined: Dec 2013
RE: Polynomial derivative causes Prime to Crash?
roadrunner: nothing is wrong. You get the result as rootof(P,Q) i.e. P(alpha) where Q(alpha)=0. This is because the simplifier rewrite all algebraic extensions in a unique one, in order to certify that it will not miss a simplification, the analog as when you add fractions like 1/2+1/3+1/6 you can get a simplification to an integer. However here it requires heavy computations.
I would recommend not to run simplify on expressions with fractional powers, by the way the title of the topic is misleading, this is not a polynomial derivative.

Regarding fractional powers, the CAS rewrites them as polynomials over simpler intermediate variables, here x^(3/5) as x^(1/5)^3.
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 Messages In This Thread Polynomial derivative causes Prime to Crash? - Spybot - 07-13-2016, 05:05 PM RE: Polynomial derivative causes Prime to Crash? - Arno K - 07-13-2016, 05:16 PM RE: Polynomial derivative causes Prime to Crash? - parisse - 07-13-2016, 06:19 PM RE: Polynomial derivative causes Prime to Crash? - roadrunner - 07-13-2016, 10:56 PM RE: Polynomial derivative causes Prime to Crash? - Spybot - 07-14-2016, 12:21 AM RE: Polynomial derivative causes Prime to Crash? - compsystems - 07-14-2016, 01:57 AM RE: Polynomial derivative causes Prime to Crash? - parisse - 07-14-2016 05:15 AM

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