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Multivariable Vandermonde determinants, amalgams of matrices and Specht modules

Abstract:

Using results of Fayers on the structure of Specht modules, we prove two different formulae for the determinant of a matrix which is obtained by amalgamating the entries of two smaller matrices. In particular, this gives formulae for multivariable Vandermonde determinants as a sum of completely factorising terms, each of which is a Vandermonde determinant in fewer variables. As an application, we deduce an elementary proof of the multiplicativity of the transfinite diameter for products of compact sets.

Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1016/j.jalgebra.2025.03.040

Authors

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Institution:
University of Oxford
Division:
MPLS
Department:
Mathematical Institute
Oxford college:
All Souls College
Role:
Author


Publisher:
Elsevier
Journal:
Journal of Algebra More from this journal
Volume:
678
Pages:
253-278
Publication date:
2025-04-11
Acceptance date:
2024-12-07
DOI:
EISSN:
1090-266X
ISSN:
0021-8693


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