Symbolic multiplication

[djpesic]

Hi all,

Can yacas do symbolic mulitiplication, with symbolic bounds?

For example: 2*2*2*2....*2 = 2^n

1*2*3*4*...*(n-1)*n = n!.

I tried with Factorize() method, but it works only when both bounds are numeric.

What i try to do: Factorize(x,1,n,2) and Factorize(x,1,n,x)

Thanks,

Djordje

[Grzegorz Mazur]

Hi,

Do I understand correctly that what you ask is analogous to the Sum(var, start, end, expr) only with multiplication instead of addition? As an example:

In> Sum(k, 1, n, k)

Out> (n*(n+1))/2

If this is so, the bad news is that there's no such function. The good news is that implementing one shoudn't be a big issue. Please report the issue to the https://github.com/grzegorzmazur/yacas/issues so it doesn't slip through the cracks and I try to implement it soon.

Best,

Grzesiek

[djpesic]

Hi,

Yes, that is right. This function should work exactly the same like de sum, but instead the sum it should do multiplication. I will create the issue.

Regards,

Djordje