Quadratic Forms
Jul 24, 2026TheorySergey
Quadratic forms and their matrix, definiteness, Sylvester's criterion, and canonical form.
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160
Works to read here
197 results
Change of Basis
Jul 24, 2026TheorySergey
The change-of-basis matrix, recomputing a vector's coordinates and an operator's matrix, and the orthonormal case.
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220
Eigenvectors and Eigenvalues
Jul 24, 2026TheorySergey
Eigenvectors and eigenvalues, the characteristic equation, eigenspaces, and diagonalization of matrices.
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170
Linear Operator
Jul 24, 2026TheorySergey
A linear operator and its matrix, the action x' = Ax, similar matrices, and the formula B = C⁻¹AC.
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150
Basis, Dimension, and Span
Jul 24, 2026TheorySergey
Linear dependence of vectors, basis and coordinates, dimension, subspaces, and linear span.
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220
Linear (Vector) Space
Jul 24, 2026TheorySergey
The axioms of a linear (vector) space, examples and counterexamples.
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160
Cramer's Rule and Gaussian Elimination
Jul 24, 2026TheorySergey
Two methods for solving a SLAE — Cramer's rule via determinants and the universal Gaussian elimination method, with examples.
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250
Systems of Linear Equations
Jul 24, 2026TheorySergey
Linear systems in matrix form, the Kronecker–Capelli theorem, homogeneous systems, and the fundamental system of solutions.
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210
Linear Dependence and Independence of Rows
Jul 24, 2026TheorySergey
Linear dependence and independence of the rows of a matrix, the criterion via a linear combination, and the connection to rank.
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560
Matrix Rank
Jul 24, 2026TheorySergey
Minors and the rank of a matrix, invariance of rank under elementary transformations, and a practical method for computing it.
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190
Inverse Matrices
Jul 24, 2026TheorySergey
Nonsingular matrices, the invertibility criterion, the adjugate-matrix formula, and the Gauss–Jordan method.
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120
Properties of Determinants
Jul 24, 2026TheorySergey
The basic properties of determinants with brief proofs, and their use in simplifying computations.
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260
Determinant via Permutations
Jul 24, 2026TheorySergey
The direct definition of a determinant via permutations: inversions, parity, and a sum of n! terms.
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170
Determinant
Jul 24, 2026TheorySergey
The determinant of a square matrix — its meaning, minors and cofactors, Laplace expansion, and computation methods.
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190
Properties of Matrix Operations
Jul 24, 2026TheorySergey
The basic properties of addition, scalar multiplication, transposition, and multiplication of matrices, with justifications.
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180
Basic Operations on Matrices
Jul 24, 2026TheorySergey
Addition, scalar multiplication, transposition and multiplication of matrices, along with subtraction, powers, and trace.
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150