Abstract
In order to introduce the main ideas of Linear Algebra, we first study matrix algebra. So, the first thing we begin with is the following simple linear equation:
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Notes
- 1.
See Chap. 6 for the definition of matrices through linear transformations.
- 2.
The size of a matrix is described in terms of the rows and columns it contains.
- 3.
This binary operation is defined from \(\mathcal{M}_{m\times n}(\mathbb{K}) \times \mathcal{ M}_{m\times n}(\mathbb{K}) \rightarrow \mathcal{ M}_{m\times n}(\mathbb{K})\) and takes (A, B) from \(\mathcal{M}_{m\times n}(\mathbb{K}) \times \mathcal{ M}_{m\times n}(\mathbb{K})\) to A + B in \(\mathcal{M}_{m\times n}(\mathbb{K})\).
- 4.
Named after the Norwegian mathematician Niels Henrik Abel.
- 5.
As we will see later, the number a + d is called the trace of A, the number ad − bc is called the determinant of A, and the polynomial p(λ) = λ 2 − (a + d)λ + (ad − bc) is called the characteristic polynomial of A. See Definition 7.3.2.
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Said-Houari, B. (2017). Matrices and Matrix Operations. In: Linear Algebra. Compact Textbooks in Mathematics. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-63793-8_1
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