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Re: [Axiom-math] About "%%"
From: |
William Sit |
Subject: |
Re: [Axiom-math] About "%%" |
Date: |
Sun, 15 Jan 2006 16:58:05 -0500 |
Daniel wrote:
> I'm using Axiom in Debian GNU/Linux for corroborate some results of
> numerical calculus. In a exercise of inverse Laplace transform, I've to
> calculate f(0) if F(s) = (s**2 - 9*s - 32)/(2*s**3 - 3*s + 4).
>
> At the begining, I thought to use partial fraction decomposition but the
> denominator have irrational roots :-( Then I thought to use Axiom for
> give me a idea of its resolution. The fact is that inverseLaplace give
> me %%A0 or %%AO squared in the solution. How this values are
> interpreted?
The a = %%A0 is the real root of the denominator, which then factors as:
2*s**3 - 3*s + 4 = (s - a)(2*s**2 + 2*a*s + 2*a**2 -3)
The coefficients of t in the exponential functions are the roots of the
quadratic factor based on the quadratic formula. Axiom should have said what
%%A0 is.
William