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Jim Horn · (This post was last modified: 04-15-2016 07:49 PM by Jim Horn.)

The capital pi is used to represent the product of a number of terms, just as a capital sigma represents the sum of a number of terms. I can't draw them here, but sigma of k=1 to n of k means the sum of 1 through n (i.e. [n^2+n]/2). Replacing that with the capital pi means the *product* of 1 through n (i.e. n factorial).

(04-13-2016 06:35 PM)ggauny@live.fr Wrote: BTW, what is this sign hight level mathematic : like "Pi" but very huge ?