The Discrete Mathematical Charms of Paul Erdos

‘Vašek Chvátal was born to write this one-of-a-kind book. Readers cannot help but be captivated by the evident love with which every page has been written. The human side of mathematics is intertwined beautifully with first-rate exposition of first-rate results.’ Donald Knuth, Stanford University‘This book is a treasure trove from so many viewpoints. It is a wonderful introduction and an alluring invitation to discrete mathematics - now a central field of mathematics identified mostly with the hero of this book. With lucid, carefully planned chapters on different topics it demonstrates the unique way in which Paul Erdős, one of the most prolific and influential mathematicians of the twentieth century, invented and approached problems. Sprinkled with historical and personal anecdotes and pictures, it opens a window to the unique personality of ‘Uncle Paul’. And implicitly, it reveals the charming and candid way in which Vašek Chvátal, an authority in the field and a lifelong friend and collaborator of Erdős, likes to combine teaching and story-telling.’ Avi Wigderson, IAS, Princeton‘Paul Erdős is one of the founding fathers of modern combinatorics, whose ability to pose beautiful problems greatly determined the development of this field and influenced many other areas of mathematics. This book uses some basic questions, which intrigued Paul Erdős, to give a nice introduction to many topics in discrete mathematics. It contains a collection of beautiful results, covering such diverse subjects as discrete geometry, Ramsey theory, graph colorings, extremal problems for graphs and set systems and some others. It presents many elegant proofs and exposes the reader to various powerful combinatorial techniques.’ Benjamin Sudakov, ETH Zurich‘This is a brilliant book. It manages in one fell swoop to survey and develop a large part of combinatorial mathematics while at the same time chronicling the work of Paul Erdős. His contributions to different areas of mathematics are seen here to be part of a coherent whole. Chvátal’s presentation is particularly appealing and accessible. The wonderful personal recollections add to the mathematical content to provide a portrait of Erdős’ mind recognizable to those who knew him.’ Bruce Rothschild, University of California, Los Angeles‘Vašek Chvátal’s book is a gem. Paul Erdős’ favorite problems and best work are beautifully laid out. Readers unfamiliar with Erdős’ work cannot fail to appreciate its power and elegance, and those who have seen bits and pieces will have the pleasure of seeing it thoughtfully and lovingly presented by a master. It’s hard to imagine now, but there was a time when combinatorics was thought to be a jumble of results without depth or coherence. ‘Uncle’ Paul understood its heart and soul, and nowhere is this more evident than in Chvátal’s wonderful compendium. This volume belongs on every math-lover’s night-table!’ Peter Winkler, Dartmouth College‘Beautiful mathematics is presented with great care and clarity in Vašek Chvátal’s book, complemented with well-written anecdotes and personal reminiscences about Paul Erdős. This combination makes the book a very enjoyable reading and a lively tribute to the memory of one of the most prolific mathematicians of all time. Studying discrete mathematics from this book is likely to give a great experience to students and established researchers alike.’ Gábor Simonyi, Rényi Institute, Budapest‘… Chvátal (emer., Concordia Univ.) has created a gem in this work and deserves congratulation … Highly recommended.’ J. Johnson, Choice Magazine‘This wonderfully written book is undoubtedly a significant contribution to the growing body of literature on the various developments in discrete mathematics over the last several decades. Still, to reduce it to only its mathematical dimension would be an act of injustice not only towards the book but also towards its author. The book is a powerful homage to Paul Erdos as one of the leading mathematicians of the twentieth century as well as a person who, with his unprecedented level of academic generosity and overall human kindness, was one of the pillars of the discrete mathematics community during his lifetime.’ Veselin Jungic, MathSciNet‘The book … is demanding, but a pleasure to work through. I highly recommend it to everyone with a good background in calculus and elementary number theory.’ Franz Lemmermeyer, zbMATH‘Chvátal tells the story of many discrete mathematical ideas, centered around the work of Paul Erdős … Chvátal does an exceptional job of putting the mathematical discoveries in their historical context and combining them with photos, personal anecdotes about his time spent with Erdős, and letters between the two. This context, along with the topics chosen and the clear writing, make this book exceptional. … The book can, of course, be used as a graduate-level textbook. But it is far more than that. [It] is a phenomenal reference for discrete mathematicians and a ‘simple introduction’ to discrete mathematics for any mathematician with the desire to learn about the work and life of Paul Erdős.’ Ranjan Rohatgi, Notices of the American Mathematical Society

Vašek Chvátal is Professor Emeritus of Concordia University, where he served as Canada Research Chair in Combinatorial Optimization (2004–2011) and Canada Research Chair in Discrete Mathematics from 2011 to his retirement in 2014. He is the author of Linear Programming (1983) and co-author of The Traveling Salesman Problem: A Computational Study (2007). In the 1970s, he wrote three joint papers with Paul Erdős. He is a recipient of the CSGSS Award for Excellence in Teaching, Rutgers University (1992, 1993, 2001) and co-recipient of the Beale-Orchard-Hays Prize (2000), Frederick W. Lanchester Prize (2007), and John von Neumann Theory Prize (2015).