It's kind of weird for Permutation City and Schild's Ladder to be under "Soft Science Fiction".
sindresorhus opened this issue · comments
Where should they be?
https://www.reddit.com/r/scifi/comments/380izr/scifi_worth_consuming/crrj345
They're right. Schild's Ladder is SF so hard you could cut diamond with it, and Permutation City, while definitely softer, is also definitely hard SF :)
Just had to go "pppfffttttt!" in amused horror at the idea of those books being "soft". I don't think there is any book ever written that is harder SF than Schild's Ladder, or any triology that is harder SF than these three (including Diaspora). If there's a top 10 of all time hard SF ever written, Schild's Ladder is #1.