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/Bo

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/ 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.