Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Provides insight

I read this book over 20 yrs. ago, recommended by a friend who's a first rate mathematician, J. Palmore. I recall 2 things. First, that 'fairness' is not uniquely defined. Nice examples are given. Second, the 5 methods of mathematical proof: (i) proof by reference to the literature, (ii) proof by intimidation ("It's obvious!"), etc. Also recommended: to read in Descartes' memoirs the description of how he came on the idea to invent analytic geometry and derivatives of simple curves.