This is a popular book that chronicles the historical attempts to prove the fifth postulate of Euclid on parallel lines that led eventually to the creation of non-Euclidean geometry. To absorb the mathematical content of the book, the reader should be familiar with the foundations of Euclidean geometry at the high school level. But besides the mathematics, the book is also devoted to human stories about the people, brilliant mathematicians starting from Pythagoras and terminating with Gauss, Lobachevsky and Klein who first tried to prove the fifth postulate (whose formulation seemed to them too complicated to be a real postulate and not a theorem, hence the title "In the search for beauty"). It was understood in the 19th century that such proof was impossible leading to a revolution of mathematics. The two final chapters are devoted to Einstein and his general relativity. The human stories represent historical essays with a chapter devoted to Omar Khayyam, who was not only a poet, but also a brilliant scientist and mathematician.
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