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Formalized Mathematics

(a computer assisted approach)

Editor-in-Chief: Matuszewski, Roman

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Volume 15, Issue 1 (Jan 2007)


Basic Properties of Determinants of Square Matrices over a Field1

Karol Pąk
Published Online: 2008-06-13 | DOI: https://doi.org/10.2478/v10037-007-0003-x

Basic Properties of Determinants of Square Matrices over a Field1

In this paper I present basic properties of the determinant of square matrices over a field and selected properties of the sign of a permutation. First, I define the sign of a permutation by the requirement

where p is any fixed permutation of a set with n elements. I prove that the sign of a product of two permutations is the same as the product of their signs and show the relation between signs and parity of permutations. Then I consider the determinant of a linear combination of lines, the determinant of a matrix with permutated lines and the determinant of a matrix with a repeated line. Finally, at the end I prove that the determinant of a product of two square matrices is equal to the product of their determinants.

MML identifier: MATRIX11, version: 7.8.04 4.81.962

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About the article

Published Online: 2008-06-13

Published in Print: 2007-01-01

Citation Information: Formalized Mathematics, ISSN (Online) 1898-9934, ISSN (Print) 1426-2630, DOI: https://doi.org/10.2478/v10037-007-0003-x.

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