I use MIT/GNU Scheme 12.1 version for most of comments. I sometimes use Racket v8.12.


IMHO the SICP solutions in this wiki have many detailed comments which will take much longer time than merely doing the exercises. There are also some redundant comments since there is no review for each comment as Stack Overflow/Exchange does. But there may be valuable comments in this long list of comments like in sicp-ex-2.14-2.15-2.16, I normally read all the comments.

Normally, if I say "same" between 2 comment implementations, it means their basic ideas are same.


If my comments have some errors, please contact me at Thanks in advance.