On Fri, Jan 08, 2021 at 01:11:41PM -0800, 'Nasser M. Abbasi' via FriCAS -
computer algebra system wrote:
>
> There are antiderivatives generated by Fricas which uses %iint.
>
<snip>
>
> Is it possible that fricas not use %iint as that causes problem converting
> to Latex.
>
> Here is an example
>
> sage: x,a,b,n=var('x a b n')
> sage: integrate(x^2*(a+b*log(c*x^n))*polylog(3,e*x),x, algorithm="fricas")
> -1/972*(4*(4*b*n - 3*a)*x^3*e^3 + 9*(3*b*n - 2*a)*x^2*e^2 + 36*(2*b*n -
> a)*x*e + 36*(3*b*n*x^3*e^3*log(x) + 3*b*x^3*e^3*log(c) - (2*b*n -
> 3*a)*x^3*e^3 - b*n)*%iint(x, -log(-x*e + 1)/x) - 36*((b*n - a)*x^3*e^3 -
> b*n + a)*log(-x*e + 1) - 6*(2*b*x^3*e^3 + 3*b*x^2*e^2 + 6*b*x*e -
> 6*(b*x^3*e^3 - b)*log(-x*e + 1))*log(c) - 6*(2*b*n*x^3*e^3 + 3*b*n*x^2*e^2
> + 6*b*n*x*e - 6*(b*n*x^3*e^3 - b*n)*log(-x*e + 1))*log(x) -
> 108*(3*b*n*x^3*e^3*log(x) + 3*b*x^3*e^3*log(c) - (b*n -
> 3*a)*x^3*e^3)*polylog(3, x*e))*e^(-3)
<snip>
> Is there a way for FriCAS not to use % in the output it generates?
This is a bug. '%iint' should be internal only and should not
appear in the output of integrator.
BTW. This issue was already reported by Martin Rubey.
--
Waldek Hebisch
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