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The authors extend sincere thanks to David Pengelley for his valuable comments and advice concerning this paper.
About the Authors
Kurt Herzinger is a member of the Department of Mathematical Sciences at the United States Air Force Academy in Colorado Springs, Colorado. He earned his Ph.D. in mathematics from the University of Nebraska-Lincoln in 1996. His research program primarily focuses on problems in numerical semigroups motivated by topics in commutative algebra. Recently, Kurt has taken an interest in problems involving Greek ladders thanks to meeting Prof. Robert Wisner at a MAA regional meeting in 2009.
Robert "Bob" Wisner is Professor Emeritus of Mathematics at New Mexico State University. He was founding editor of SIAM Review, a publication of the Society for Industrial and Applied Mathematics. He was the first full-time Executive Director of the MAA's Committee on the Undergraduate Program in Mathematics (CUPM), 1960-1963. Bob also authored or coauthored numerous K-12 textbooks for Scott, Foresman; was Consulting Editor in Mathematics for Brooks/Cole for over 25 years; coauthored a liberal arts mathematics textbook; and recently coauthored a series of interactive calculus, business calculus, pre-calculus, and AP calculus textbooks, available on CD from Hardy Calculus.