Dear scientific researchers, may I ask you, what is the function of the ∑ in the picture?

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Weida Xu

The maximum and minimum values are already taken in the brackets, which are clear values. Is ∑ still useful?

W.J. Colonna

7/11/24

Dear Weida,

The symbol Σ (sigma) is generally used to denote a sum of multiple terms.

I hope this helps you.

Bill Colonna

Midwest Wine & Grape Industry Institute, Iowa State University, Ames, Iowa, USA. [email protected]

W.J. Colonna The maximum and minimum values are already taken in the brackets, which are clear values. Is ∑ still useful?