“Roy Weintraub retells the history of twentieth-century economics through a series of engagements-duels of intellect and imagination-between individual members of two scientific communities: the mathematicians and the economists. A totally original, idiosyncratic, and highly personal account which illuminates brilliantly not just how economics became mathematized, but how mathematics cut free from the objects of science.”-Mary S. Morgan, London School of Economics and University of Amsterdam “The mathematization of economics is probably the most important development in the history of twentieth-century economics. This book provides fascinating accounts of important episodes in this process and should interest anyone who wants to understand how and why it took place.”-Roger Backhouse, University of Birmingham