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sum notation ,

Subject: sum notation ,
From: "vsgdp"
Date: Sat, 30 Sep 2006 10:07:50 -0700
Newsgroups: sci.math
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 ) ?




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