Oh man thanks for posting this. After seeing a few APL references in comments to...

80x86 on July 31, 2019 | parent | context | favorite | on: Elementary Algebra (1971) [pdf]

Oh man thanks for posting this. After seeing a few APL references in comments today, it reminded me to go look for this exact book by Ken Iversen. Lo and behold, I just sit down to peruse HN.... And this link is right above the fold. Sweet.