what is ∑ mean? I know its in physics equations which I am very interested in.?

Question

By the way I'm new to physics and cosmology

Mike · Accepted Answer

∑ is the greek letter sigma which is used to denote a sum.

For example if we have ∑ i   --- with an i=1 on the bottom and a 3, that is the same as 1 + 2 + 3.
You see sigma notation used a lot if we want to sum up the forces over a number of particles.

http://www.mathsisfun.com/algebra/sigma-notation.html

mr. cool · Answer

It's the Greek letter sigma. When a function and limits are given as well as the sigma sign, it basically means "plug in all whole numbers found inbetween the limits (inclusive), and add the results".

Doll-Fin · Answer

Its a greek symbol known as 'sigma'

Katona · Answer

its sigma , a math sign used for a series of aditions

Ben · Answer

It is a N-ARY SUMMATION

I am sorry i don't know much about it but it is a maths symbol and is mentioned here.

http://www.fileformat.info/info/unicode/char/2211/index.htm

Anonymous · Answer

It is zigma or sigma not sute in english. JUST GOOGLE IT!

DWRead · Answer

It is the summation symbol.

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what is ∑ mean? I know its in physics equations which I am very interested in.?

7 Answers