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Some matrix functional equations
M. Bruschiab, F. Calogeroab a Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Roma, Italy
b Department of Physics, University of Rome ``La Sapienza'', Roma, Italy
Abstract:
We investigate the pair of matrix functional equations G(x)F(y)=G(xy) and G(x)G(y)=F(y/x), featuring the two independent scalar variables x and y and the two N×N matrices F(z) and G(z) (with N an arbitrary positive integer and the elements of these two matrices functions of the scalar variable z). We focus on the simplest class of solutions, i.e., on matrices all of whose elements are analytic functions of the independent variable. While in the scalar (N=1) case this pair of functional equations only possess altogether trivial constant solutions, in the matrix (N>1) case there are nontrivial solutions. The se solutions satisfy the additional pair of functional equations F(x)G(y)=G(y/x) and F(x)F(y)=F(xy), and an endless hierarchy of other functional equations featuring more than two independent variables.
Keywords:
matrix functional equations.
Citation:
M. Bruschi, F. Calogero, “Some matrix functional equations”, TMF, 189:1 (2016), 15–35; Theoret. and Math. Phys., 189:1 (2016), 1411–1429
Linking options:
https://www.mathnet.ru/eng/tmf9185https://doi.org/10.4213/tmf9185 https://www.mathnet.ru/eng/tmf/v189/i1/p15
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Abstract page: | 345 | Full-text PDF : | 140 | References: | 59 | First page: | 14 |
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