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Re:Ask HN: Recommendations for Learning Logical Reasoning? by gthyu on Saturday January 30, 2021 @05:44PM (#25973780)
Math is still the best, most direct and fastest route towards your goal that I know of. Here below is a nice free book:

https://www.people.vcu.edu/~rhammack/BookOfProof/

In fact any intro to discrete math, real analysis, abstract algebra, number theory,..., or combinatorics book would work.

Re:Ask HN: Recommendations for Learning Logical Reasoning? by billfruit on Saturday January 30, 2021 @08:36PM (#25974898)
I would specifically single out geometry, for its axiomatic nature.
Re:Ask HN: Recommendations for Learning Logical Reasoning? by yamrzou on Sunday January 31, 2021 @02:53PM (#25981943)
I wholeheartedly second this advice.
Re:Ask HN: Recommendations for Learning Logical Reasoning? by supz_k on Saturday January 30, 2021 @05:49PM (#25973824)
Thanks! That makes sense.