W.D. Wallis Books

Magic Graphs
Magic Graphs

By W.D. Wallis

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"Magic squares, their origins lost in antiquity, are among the more popular mathematical recreations. Over the years a number of generalizations have been proposed, going back in the last century t...

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A Beginner s Guide to Discrete Mathematics
A Beginner s Guide to Discrete Mathematics

By W.D. Wallis

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This introduction to discrete mathematics is aimed primarily at undergraduates in mathematics and computer science at the freshmen and sophomore levels. The text has a distinctly applied orientatio...

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Magic Graphs
Magic Graphs

By Alison M. Marr, W.D. Wallis

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Magic squares are among the more popular mathematical recreations. Over the last 50 years, many generalizations of "magic" ideas have been applied to graphs. Recently there has been a resurgence of...

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Magic Graphs
Magic Graphs

By Alison M. Marr, W.D. Wallis

Average: 0.00, 0 Ratings

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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