I think that since Miller is a self-described math geek, the difference is that [mod] behaves like the mathematical (mod n). [%] is the modulo operator used by computer science.

If my memory serves me, in number theory and abstract algebra, the m (mod n) notation is used to define a subset of the integers (called a congruence class) which contains n-1 elements.

For example, 5 (mod 3) == 2. Likewise, -5 (mod 3) == -2 (mod 3) == 1 (mod 3) == 1. Note that my use of == here represents congruence and not necessarily equality.

See http://en.wikipedia.org/wiki/Modular_arithmetic for a much more informed discussion of this topic.

~Kyle




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