Re: how to simplify sums with constant subterms?

Thanks Michel,

this also works.


Questions:


Which to prefer over

declare(sum, additive)

and

declare(sum, linear)


Just curious, why aren't these on by default?


Claude


On 17 August 2026 13:43:05 CEST, Michel Talon <[email protected]> wrote:
>(%i1) declare(sum,additive);
>(%o1)                                done
>(%i2) sum(x + a[i], i, 1, n) ;
>                                       n
>                                      ____
>                                      ╲
>(%o2)                           n x +  ⟩    a
>                                      ╱      i
>                                      ‾‾‾‾
>                                      i = 1
>
>Le 17/08/2026 à 12:34, Claude Heiland-Allen a écrit :
>> sum(x + a[i], i, 1, n) 
>

https://mathr.co.uk


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