The Numerical Range of the Luoshu Is a Piece of Cake—Almost

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Abstract:

The numerical range, easy to understand but often tedious to compute, provides useful information about a matrix. Here we describe the numerical range of a 3 × 3 magic square. Applying our results to one of the most famous of those squares, the Luoshu, it turns out that its numerical range is a piece of cake—almost.

Document Type: Research Article

DOI: http://dx.doi.org/10.4169/college.math.j.43.5.371

Publication date: November 1, 2012

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