AMS Feature Column
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AMS Feature Column - RSS Feeden-usFeeling Your Way Around in High Dimensions
http://www.ams.org/samplings/feature-column/fc-2014-06
The simplest objects of interest in any dimension, which are also the basis for approximating arbitrary objects, are the convex polytopes. and in this column I'll explain how to begin to probe them...The Knots in the Quipu, and in the Friar's Belt
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In a canonical numerical quipu, each pendent (or subsidiary) displays a number: a positive integer, expressed in decimal notation...Magical Mathematics - A Tribute to Martin Gardner
http://www.ams.org/samplings/feature-column/fc-2014-04
Perhaps no one has done more to make the world aware of mathematics than Martin Gardner...How to Make a 3D Print
http://www.ams.org/samplings/feature-column/fc-2014-03
Mathematically speaking, the 3D print is constructed from a 1-dimensional path. This article will describe how to find that path...Stereographic Projection
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In effect, stereographic projection wraps the plane around the sphere, missing only that one point...Periods
http://www.ams.org/samplings/feature-column/fc-2014-01
After a brief introduction to the combinatorics on words, which builds on some of the same ground that was discussed in a prior note, I will look at a remarkable theorem due to the mathematicians Herbert Wilf and Nathan Jacob Fine...The Polish Attack on Enigma II: Zygalski sheets
http://www.ams.org/samplings/feature-column/fc-2013-12
I'll say a little bit about how the mathematics was applied to reading German messages, up until a drastic change in procedure by the Germans, and I'll say more about how the Poles recovered after this change...Fedorov's Five Parallelohedra
http://www.ams.org/samplings/feature-column/fc-2013-11
We will see how some elegant ideas of Conway and Sloane, introduced in the 1990s, lead to Fedorov's determination of the five parallelohedra....Spherical Dodecahedral Space
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In this column I propose to work through this construction and to start by analyzing spherical dodecahedral space as an object in polyhedral geometry. ....Words and More Words
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Here I will take a brief look at some of the ways mathematics has looked at words in the hope of exploiting the resulting ideas....The Frobenius Problem: How I bought Chicken McNuggets with exact change
http://www.ams.org/samplings/feature-column/fc-2013-08
Though the problem seems like one from discrete mathematics, we will see an unexpected interplay between the continuous and discrete worlds as we use somewhat elementary techniques from calculus to arrive at a solution...More ENIGMA
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What I want to discuss in this feature is one part of Enigma operation that has been much written about elsewhere, but which still causes some confusion. This is the way in which key presses lead to rotor motion....Galileo's Arithmetic
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The manuscripts allow us very unusual, if not unique, access to the private calculations of a great scientist; it is as if we could look over his shoulder and watch him at work...Sustainability
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Can mathematics help us understand issues of sustainability and make it possible to realize enjoyable lives for all the people who share this planet, now and far into the future?...Using Projective Geometry to Correct a Camera
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There's nothing particularly deep in this problem or the solution, but I hope that it demonstrates some of the pleasure to be found in using one's mathematical intuition...How to Read QR Symbols Without Your Mobile Telephone
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How does your phone read the information in a QR code symbol? How is information stored on it?...Hurricane Sandy Meets Mathematics
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A sensitivity to mathematics and its powerful analytical tools helps give insight into Sandy's devastation and how to minimize the consequences of future powerful storms...Who's Number 1? Hodge Theory Will Tell Us
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This article describes a method, proposed by Jiang, Lim, Yao, and Ye, that uses Hodge theory to rank a large number of alternatives...Can You Do Better?
http://www.ams.org/samplings/feature-column/fc-2012-11
Recently, there has been a great deal of activity concerning the case of packing regular tetrahedra in space, which is what motivated me to put together this column.William Thurston
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What I'd like to do in this column is give an impression of what it was like to interact with him as a fellow mathematician or as a student.