An evil form of magic that
only the best of sorcerers can master. Not only does it involve numbers, but letters (mostly x and y). They somehow rearrange themselves into supposedly simpler forms of themselves.
I don't know how because I have not mastered the
dark magic of algebra yet, nor do I intend to. Teachers try to teach you formulas to learn the magic, but half the time it would only take a true sorcerer to know what's going on.