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# Is this right? watch

1. What's "sym"? Can you give us a context for this?

This looks like something I might have written in a "roots of equations" context...
2. Symmetric sum for a,b,c

The chapter in the book is symmetric and cyclic expressions
3. Looks good. See my post from ages back that you already know the location of
4. I got a question about that.

How come you had , where did the two come from? Wouldn't it be the same as the cyclic sum which is also symmetric
5. (Definition)

Therefore
6. Oh so it means you will get b^2 and c^2 twice as well

So eg.

right?
7. Exactly. This distinction is quite important and often forgotten.
8. Alright thanks
9. So does that mean that or is it just
10. The second. It is the sum across all permutations of the set

It could be expressed as

(if you are happy with that notation)
11. OK so I got a question that says prove . I proved it on the assumption that the variables a and b are the only ones involved. Is that correct? And is LHS the same as ?
12. Perhaps you mean

?
13. Yeah sorry LHS is a product not a sum
14. Ok

15. Thanks again

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Updated: November 14, 2008
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