if you multiply two summation notation

ex.

(summation (x)) *(summation(y)) do you get (sumation (xy)) ??

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- Nov 7th 2008, 07:23 AMpandakrapdo you know the properties of summation
if you multiply two summation notation

ex.

(summation (x)) *(summation(y)) do you get (sumation (xy)) ?? - Nov 7th 2008, 07:33 AMMoo
- Nov 7th 2008, 07:35 AMpandakrap
no. it = ac + cd + ad + bd

- Nov 7th 2008, 07:47 AMMoo
So try :

is equal to ?

And hence is your formula correct ?

You can see here : Cauchy product - Wikipedia, the free encyclopedia for the formula of the product of two summations ;)