> why is f(0) in an ll test = 4
Well, it needn't be. There are a number of other possibilities, but 4 is the
smallest...
> also when i went to sshool (i'm 34) 7 mod 8 == 7
> i have seen 7 mod 8 == -1
> is -1 == 7 mod 8
> which is more correct
They are both correct. If you have a congruence relation (mod n), then
you can add n to either side (it's like adding or subtracting zero).
-Lucas
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