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# Formalized Mathematics

### (a computer assisted approach)

Editor-in-Chief: Matuszewski, Roman

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1898-9934
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# Basic Properties of the Rank of Matrices over a Field

Karol Pąk
Published Online: 2008-06-09 | DOI: https://doi.org/10.2478/v10037-007-0024-5

## Basic Properties of the Rank of Matrices over a Field

In this paper I present selected properties of triangular matrices and basic properties of the rank of matrices over a field.

I define a submatrix as a matrix formed by selecting certain rows and columns from a bigger matrix. That is in my considerations, as an array, it is cut down to those entries constrained by row and column. Then I introduce the concept of the rank of a m x n matrix A by the condition: A has the rank r if and only if, there is a r x r submatrix of A with a non-zero determinant, and for every k x k submatrix of A with a non-zero determinant we have k ≤ r.

At the end, I prove that the rank defined by the size of the biggest submatrix with a non-zero determinant of a matrix A, is the same as the maximal number of linearly independent rows of A.

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Published Online: 2008-06-09

Published in Print: 2007-01-01

Citation Information: Formalized Mathematics, ISSN (Online) 1898-9934, ISSN (Print) 1426-2630,

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