This is by my personal standards a very good book for anyone who's either starting or advancing in their logical capabilities. It starts out with the basic concepts of converting an (English) sentence into mathematical symbolism (i.e. logical symbols) so that throughout the book one can compress everyday language into it's essential parts neccesary for logic argumentation as well as validating the sentence's truthfulness, the author(s) then proceed with such simple operators such as AND(conjuction), OR(disjunction), NOT(negation) and IF...THEN(conditional) for optimal understanding of the basic concepts that describe mathematical thinking. More advanced chapters then set out into the realm(s) of the different modi ('ponendo ponens'/'tolendo tolens'/'tollendo ponens'...etc), truth-tables, set theories, and so on and so forth... The author(s) have written this book in a clear and readily accessable language so that the reader ought not find any difficulties with it's understanding. I would (and vis-a-vis do so) recommend this book to all people who are either studying a mathematics-dependent subject or simply trying to improve their reasoning capacities in everyday life.
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