## sigma notation

What does this mean? (see attachment)

"Where b is a block defined by the contiguity condition c that may exist between elements of s, and n is the number of elements in that block"

I know is not possible to get a solution without the actual function, but how does this reads?
Attached Thumbnails

 PhysOrg.com science news on PhysOrg.com >> Hong Kong launches first electric taxis>> Morocco to harness the wind in energy hunt>> Galaxy's Ring of Fire
 Recognitions: Gold Member Science Advisor Staff Emeritus That notation is a little ambiguous. Just $$\sum_{c\in S} f(c)$$ would mean "caclulate f(c) for all c contained in set S, then add". But the "n" is problematic- the set S, in general, doesn't even have to be a set of numbers. My best guest would be "calculate f(c) for all c contained in set S, that are less than or equal to n, then add them."
 Great, thank you.

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## sigma notation

bitttttor, are you able to say more about the background to this? In what context did you find it?

 Tags equation, notation, sigma