looking for paper by Chapman on determinant of sum of matrices Math people: I am trying to find a paper by Chapman referenced after Remark 2.3 in the paper "On the elementary symmetric functions of a sum of matrices" by R. S. Costas-Santos posted on the arXiv (arXiv:math/0612464v5 [math.AC] 17 Sep 2009). The only information in the references is "Amer. Math. Monthly 109 (7) (2002), 665–666". I looked up that issue of the Monthly and those pages are in the Problems Section. There is no paper by a Chapman in that issue. I do not know Chapman's first name. I have e-mailed R. S. Costas-Santos at the e-mail address given in his paper but I thought I might receive a response here as fast or faster. The paper would have an identity involving the determinant of a sum of arbitrary matrices.

His name is Robin Chapman.

See: <

Alberto Facchini, Francesco Barioli, Robin Chapman, Ron Martin Carroll: Nonsingular Sums of Matrices: 10784. 665-666, 2002

Aside: Robin Chapman was actually a moderator on MSE (way before my time)!