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This is a brilliant and sparklingly original account of algebra through the ages, by one of mathematics' great popularizers: '"Unknown Quantity" buzzes with rivalries, frustrations and breakthroughs...A first-rate account that even algebraphobes will struggle to fault.' - "New Scientist".'Here is the story of algebra.' With this deceptively simple introduction, "Unknown Quantity" opens, thirty-eight centuries ago, at the time of Abraham and Isaac. In stylish and accessible prose, Derbyshire shows how the invention of algebra was more than the beginning of a specific discipline of mathematics; it was also the birth of a new way of thinking that altered, forever, the ways in which we see and understand our world.