Difference between Sum and sum

Question:Difference between Sum and sum

Posted: Zeineb 520 Product: Maple

June 09 2016

Dear all

I have a confusion between these symbol

Sum , add and sum

If we consider u(n) is a sequence and n integer

and what is the difference between

sum( u(n),n=0..infinity)

Sum(u(n),n=0..infinity)

and sum('u(n)', n=0..infinity)

Many thanks

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