Re: sum notation ,

[A N Niel]

In article <6rxTg.335$zf3.37@fed1read03>, vsgdp <hello@xxxxxxxx> wrote:

> Hi, what does the following notation mean:
> 
> Sum( a_k*b_j, for 1 <= k < j <= n )?
> 
> Is it a double sum:
> 
> Sum( Sum( a_k*b_j, from k = 1 to j-1, from j = 1 to n ) ?
> 
> 
> 

Probably let j start at 2