Maple says that

Attachment 29407

why is each of the|Xi-Xj| multiplied by two?

Is it that |Xi - Xj| =|Xj - Xi|?

I had not realized that double summation multiplies sums every combination of Xi and Xj

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- Oct 8th 2013, 09:26 AMkingsolomonsgravesummation question
Maple says that

Attachment 29407

why is each of the|Xi-Xj| multiplied by two?

Is it that |Xi - Xj| =|Xj - Xi|?

I had not realized that double summation multiplies sums every combination of Xi and Xj - Oct 8th 2013, 10:05 AMemakarovRe: summation question
- Oct 8th 2013, 08:44 PMibduttRe: summation question
- Oct 9th 2013, 04:27 AMSlipEternalRe: summation question
On line 4, you keep i=1 for all three terms. On line 5, you keep i=2 for all three terms. Then on line 6, you keep i=3 for all three terms.

It should read (beginning on line 4):

- Oct 9th 2013, 08:39 PMibduttRe: summation question
Sorry i made some typing mistake, it shd be as under

Attachment 29432 - Oct 10th 2013, 06:44 AMSlipEternalRe: summation question
Yes, that is correct.