Investigating Symbols, Functions, and Graphs. Gel'fand, I.M., E.G. Glagoleva, and E.E. Shnol. Functions and Graphs. Peterson, I. 1988. Calculus in the palm of your hand.
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He is the author of The Mathematical Tourist, Islands of Truth, Newton's Clock, Fatal Defect, and The Jungles of Randomness. For children ages 10 and up.