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Puzzled
Understanding relationships among numbers

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Peter WinklerAuthors Info & Claims

Communications of the ACM, Volume 52, Issue 5

Page 112

https://doi.org/10.1145/1506409.1506432

Published: 01 May 2009 Publication History

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Abstract

Welcome to three new challenging mathematical puzzles. Solutions to the first two will be published next month; the third is as yet (famously) unsolved. In each puzzle, the issue is how numbers interact with one another.

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Ferreira JMendes ACunha ABaquero CSilva PBarbosa LOliveira J(2011)Logic training through algorithmic problem solvingProceedings of the Third international congress conference on Tools for teaching logic10.5555/2021573.2021581(62-69)Online publication date: 1-Jun-2011
https://dl.acm.org/doi/10.5555/2021573.2021581
Ferreira JMendes ACunha ABaquero CSilva PBarbosa LOliveira J(2011)Logic Training through Algorithmic Problem SolvingTools for Teaching Logic10.1007/978-3-642-21350-2_8(62-69)Online publication date: 2011
https://doi.org/10.1007/978-3-642-21350-2_8
Ferreira JMendes ABackhouse RBarbosa L(2009)Which Mathematics for the Information Society?Proceedings of the 2nd International Conference on Teaching Formal Methods10.1007/978-3-642-04912-5_4(39-56)Online publication date: 27-Oct-2009
https://dl.acm.org/doi/10.1007/978-3-642-04912-5_4

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Puzzled

Understanding relationships among numbers
1. Mathematics of computing

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Welcome to the new puzzle column. Each column will present three puzzles. The first two will have known (and usually elegant) solutions that will appear in the next issue of Communications. The third will be an open problem; good luck with that one.

...
Puzzled: Solutions and sources

Last month (Nov. 2011, p. 120) we posted a trio of brainteasers, including one as yet famously unsolved, concerning distances between points on the plane. Here, we offer solutions to two of them. How did you do?
Puzzled: Solutions and sources

It's amazing how little we know about the simple, ordinary, axis-aligned rectangle. Last month (p. 112) we posted a trio of brainteasers, including one as yet unsolved, concerning rectangles galore. Here, we offer solutions to at least two of them. How ...

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Communications of the ACM Volume 52, Issue 5

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May 2009

132 pages

ISSN:0001-0782

EISSN:1557-7317

DOI:10.1145/1506409

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Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Association for Computing Machinery

New York, NY, United States

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Published: 01 May 2009

Published in CACM Volume 52, Issue 5

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Ferreira JMendes ACunha ABaquero CSilva PBarbosa LOliveira J(2011)Logic training through algorithmic problem solvingProceedings of the Third international congress conference on Tools for teaching logic10.5555/2021573.2021581(62-69)Online publication date: 1-Jun-2011
https://dl.acm.org/doi/10.5555/2021573.2021581
Ferreira JMendes ACunha ABaquero CSilva PBarbosa LOliveira J(2011)Logic Training through Algorithmic Problem SolvingTools for Teaching Logic10.1007/978-3-642-21350-2_8(62-69)Online publication date: 2011
https://doi.org/10.1007/978-3-642-21350-2_8
Ferreira JMendes ABackhouse RBarbosa L(2009)Which Mathematics for the Information Society?Proceedings of the 2nd International Conference on Teaching Formal Methods10.1007/978-3-642-04912-5_4(39-56)Online publication date: 27-Oct-2009
https://dl.acm.org/doi/10.1007/978-3-642-04912-5_4

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Puzzled: Solutions and sources

Puzzled: Solutions and sources

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