How do you infer that "[SICP] was about 'hard' math" from "some of the math [in SICP] was hard," by the way? You qualified your inference with a conditional (t

How do you infer that "[SICP] was about 'hard' math" from "some of the math [in SICP] was hard," by the way? You qualified your inference with a conditional (to be fair); but I still find the implication irritating.