Sergiy KlymchukDr Sergiy Klymchuk is an Associate Professor of the School of Computing and Mathematical Sciences at the Auckland University of Technology, New Zealand. He has 29 years of experience teaching university mathematics in different countries. He was bornin Ukraine in 1958. Since 1996 he has lived in New Zealand. His PhD (1988) from Odessa National University, Ukraine was in differential equations. At present his main research interests are in mathematics education. He is a member of the Royal Society of New Zealand. He is also a member of a number of international groups in mathematics education including International Group for the Psychology in Mathematics Education (PME) and International Community of Teachers of Mathematical Modelling and Applications (ICTMA). Apart from Counterexamples in Calculus he also has written Paradoxes and Sophisms in Calculus as a supplementary resource to enhance teaching and learning of introductory calculus. He has more than 140 publications including three books on popular mathematics and science that have been, or are being, published in 11 countries: Money Puzzles, Science Puzzles and Shape Puzzles. Read More Read Less