Keefer began scribbling madly. He was not going to miss anything in this class this year. Not a single thing. Ok, maybe one or two things.

He wracked his brain, trying to remember five years' worth of Arithmancy lessons. He raised both hands as usual before replying. "Professor Hadley, I seem to remember the Agrippan and Chaldean methods, but for some reason the Pythagorean method rings a bell as well. I know that the Chaldeans had an issue with the number 9, for some reason. Perhaps it's somehow related to their use of a base-60 number system.." he trailed off. Struggling to find his train of thought, he finally continued. "And the Agrippan, or perhaps Pythagorean, method assigns the numbers 1-8 AND 9 to each letter of the alphabet."

So that was most likely at least partially wrong, but after all, it was the first lesson of term. He wasn't expected to know everything yet. Right?