[Gllug] More Procmail

[Paul Brazier]

> I would appreciate if someone could please enlighten me to 
> this particularly
> the left side of the equation.
>                                              n
>                    n   k-1               x   - 1
>               w * Sum x    = w * ----------
>                    k=1                    x - 1

This is the sum of a geometric progression

i.e. w * (1 + x + x^2 + x^3 + x^4 + ... + x^(n-1))

they are just two algebraically equivalent ways of writing the same
thing.

because (1 + x + x^2 + x^3 + x^4 + ... + x^(n-1)) * (x - 1) = x^n - 1

I guess it's just the way that scores are weighted if an expression
apears multiple times.

Paul.


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