Polynomial derivative causes Prime to Crash?

07142016, 05:15 AM
Post: #7




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  07132016, 05:05 PM
RE: Polynomial derivative causes Prime to Crash?  Arno K  07132016, 05:16 PM
RE: Polynomial derivative causes Prime to Crash?  parisse  07132016, 06:19 PM
RE: Polynomial derivative causes Prime to Crash?  roadrunner  07132016, 10:56 PM
RE: Polynomial derivative causes Prime to Crash?  Spybot  07142016, 12:21 AM
RE: Polynomial derivative causes Prime to Crash?  compsystems  07142016, 01:57 AM
RE: Polynomial derivative causes Prime to Crash?  parisse  07142016 05:15 AM

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