memory

i scribbled this in the margin of a test i took the other day

a couple of hours ago i would have sworn that i knew and understood the algorithmic approach to changing the base in a difference equation. it's unfortunate that tests, while great for establishing application of a memorized algorithm, do so little to show understanding and internalization of the concepts which that regurgitated problem solving strategy actually represents.

a.k.a. no matter how much i fiddle with the terms, it appears that i have forgotten the formula :-(