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How does Sipser's content compare to Ullman's (free) Foundations of Computer Science?

http://i.stanford.edu/~ullman/focs.html

As far as x86 assembly goes, I found Kip Irvine's book to be pretty great. (not free) It's not a subject I would want to spend more time on, though.

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They're not similar at all. FoCS is mostly about introductory programming and data structures (with a tiny bit about automata). Sipser's book is about computation and complexity - it's comparable to Hopcroft and Ullman's Intro to automata theory, languages, and computation, for which Ullman recommends FoCS or equivalent as a prerequisite.

Interesting. Thanks.

Coincidentally I just signed up for Ullman's Automata course at Coursera. The description makes it seem pretty basic but I'm interested to see what he does with it.

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