# Simply Logical by Peter Flach Hacker Approved page: https://hackerapproved.com/p/simply-logical/ 2 people recommended Simply Logical by Peter Flach in Hacker News comments and none criticized it, November 2025 to October 2026. It was recommended in 2 of 12 months, in 2 threads. It does not meet the Hacker Approved badge rule. 1 of the 2 people who recommend it commented in one thread, “My Gripes with Prolog”. **Verdict:** Two commenters recommend it as a logic programming book, and one notes that a PDF copy is easy to get. Summary written by Claude from 2 comments. ## Why people recommend it - Recommended by Hacker News commenters (1 comment in the sample): "I can recommend "Simply Logical" ([source](https://news.ycombinator.com/item?id=46649946)) - PDF easy to obtain (1 comment in the sample): "you can get a PDF just fine." ([source](https://news.ycombinator.com/item?id=48241705)) ## Other computer science textbooks people recommend - [Structure and Interpretation of Computer Programs by Abelson and Sussman](https://hackerapproved.com/p/structure-and-interpretation-of-computer-programs/): 51 recommend, 8 mixed, 4 criticize - [The Art of Computer Programming by Donald E. Knuth](https://hackerapproved.com/p/art-of-computer-programming/): 25 recommend, 3 mixed, 6 criticize - [Quantum Computation and Quantum Information by Nielsen and Chuang](https://hackerapproved.com/p/quantum-computation-and-quantum-information/): 9 recommend, 3 mixed, 0 criticize - [Digital Design and Computer Architecture by Harris and Harris](https://hackerapproved.com/p/digital-design-and-computer-architecture/): 8 recommend, 0 mixed, 0 criticize ## The badge A product earns the Hacker Approved badge when at least 10 people recommend it, recommenders outnumber critics at least 2 to 1 (mixed feelings count toward neither side), it was recommended in at least 4 of the 12 months and in at least 5 different threads, and no single thread supplies more than half of the people who recommend it. Health and money products are never badged. ## Cite as Hacker Approved, "Simply Logical by Peter Flach", https://hackerapproved.com/p/simply-logical/ (2 recommend, 0 mixed, 0 criticize; Hacker News comments, November 2025 to October 2026). Counts updated 2 Nov 2026, with data through October 31, 2026.