Mastering Algebra: An Axiomatic Approach (Second Edition) by Roger W. Oster
This easy-to-read and well-thought-out book takes a different approach to learning algebra: instead of just robotically practicing the rules of algebra, this book explains the "why" of the rules. It explains the function of all the axioms and definitions of algebra along with their logical consequences while ignoring all the superfluous and often confusing rules found in so many other algebra texts (like the butterfly rule, invert and multiply rule, cross multiply rule, P.E.M.D.A.S., etc.).
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