Le mercredi 2 novembre 2016 20:09:13 UTC+1, John H Palmieri a écrit :
>
> I don't know enough about Maxima's syntax to evaluate it directly there. 
> Just for kicks, I also installed "giac", since that was listed as an option 
> for the "algorithm" keyword for "sum":
>
> sage: sum(1/((n+1)*(2*n-1)), n, 0, oo, algorithm='giac')
> +Infinity
>
> Not an improvement.
>
>
Probably for the same reason as maxima, the singularity n=1/2 inside the 
summation domain, if you start at 1 the answer is correct. Now fixed in 
geogebra svn and in xcas offline
http://www-fourier.ujf-grenoble.fr/~parisse/xcasen.html#+normal(sum(1/((n+1)*(2*n-1)),%20n,%200,%20inf)&
 

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