Volume IV presents 20 papers on probability, 17 on combinatorics, and 18 on the teaching and learning of mathematics. Pólya has made a number of fundamental contributions to the first two fields, including perhaps the first use of the term "central limit theorem," but his major influence on mathematics has clearly been his approach to pedagogy. Many of the papers throughout these volumes have a strongly pedagogical flavor, but the papers in the third section of this volume focus squarely on the real business of how to do mathematics - how to formulate a problem and then create a solution.

George Pólya is professor emeritus at Stanford University. These volumes are the twenty-second and twenty-third in the series Mathematicians of Our Time, edited by Gian-Carlo Rota.
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