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**Alex2704**- Replies: 0

Hey,I've been revising for my math semester paper and I have just come across a problem I can't solve :

Prove that in the triangle ABC,IH || BC <=>

**Alex2704**- Replies: 0

I've tidied up the Latex to eliminate an error. Hope this is what you intended, Bob

Let n be a whole number,n>=2.Real numbers

with the sum s have the property that

Prove that

.

I have been trying to prove it for days but I had no luck.Please help me !

EDIT:Thanks,Bob!It was the first time I have ever tried to write sums in Latex

Oh right.Thanks for your speedy reply !

**Alex2704**- Replies: 4

Hello! I have recently found a problem and I don't know what this notation means.The problem says : find all the triples (x,y,z) for which

{(x-y)/(y-z),(y-z)/(z-x),(z-x)/(x-y)}={x,y,z}.I don't understand what {x,y,z} means.Thanks in advance!

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