
06132026
j
2013a.00672
Trenkler, G\"otz
Trenkler, Dietrich
The numerical range of the Luoshu is a piece of cake  almost.
Coll. Math. J. 43, No. 5, 371376 (2012).
2012
Mathematical Association of America (MAA), Washington, D.C.
EN
H65
G75
matrices
magic suares
Luoshu magic squares
numerical range
doi:10.4169/college.math.j.43.5.371
Summary: 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 $3 \times 3$ 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.