Problem calculating an expression with roots

02032015, 11:59 AM
(This post was last modified: 02032015 12:39 PM by Snorre.)
Post: #28




RE: Problem calculating an expression with roots
Hello Reto,
In Home it seems to be related to evaluation order: 1/3 is evaluated to the approximated floating 0.333 first. There seems to be no further internal test if the exponent is rational. If you enter it as ³√(8) you'll get 2. (The other way around is similiar: (1/3)NTHROOT(2) is not the same as (2)^3) The CAS seems to evaluate (1)^(p/q) to the first complex solution as long as the denominator q is ≤4 (autosimplification turned off). Sorry, can't tell you why (just guess). 

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