An Introductory Geometrical Application |
Nested triangles / 1.1: |
The transformation $\sigma$ / 1.2: |
The transformation $\sigma$ iterated with different values of $s$ / 1.3: |
Nested polygons / 1.4: |
Introductory Matrix Material |
Block operations / 2.1: |
Direct sums / 2.2: |
Kronecker product / 2.3: |
Permutation matrices / 2.4: |
The Fourier matrix / 2.5: |
Hadamard matrices / 2.6: |
Trace / 2.7: |
Generalized inverse / 2.8: |
Normal matrices, quadratic forms, and field of values / 2.9: |
Circulant Matrices |
Introductory properties / 3.1: |
Diagonalization of circulants / 3.2: |
Multiplication and inversion of circulants / 3.3: |
Additional properties of circulants / 3.4: |
Circulant transforms / 3.5: |
Convergence questions / 3.6: |
Some Geometric Applications of Circulants |
Circulant quadratic forms arising in geometry / 4.1: |
The isoperimetric inequality for isosceles polygons / 4.2: |
Quadratic forms under side conditions / 4.3: |
Nested n-gons / 4.4: |
Smoothing and variation reduction / 4.5: |
Applications to elementary plane geometry: n-gons and $K_r$-grams / 4.6: |
The special case: $\text{circ}(s, t, 0, 0, \dots, 0)$ / 4.7: |
Elementary geometry and the Moore-Penrose inverse / 4.8: |
Generalizations of Circulants: $g$-Circulants and Block Circulants |
$g$-circulants / 5.1: |
$0$-circulants / 5.2: |
PD-matrices / 5.3: |
An equivalence relation on $\{1, 2, \dots, n\}$ / 5.4: |
Jordanization of $g$-circulants / 5.5: |
Block circulants / 5.6: |
Matrices with circulant blocks / 5.7: |
Block circulants with circulant blocks / 5.8: |
Further generalizations / 5.9: |
Centralizers and Circulants |
The leitmotiv / 6.1: |
Systems of linear matrix equations / 6.2: |
The centralizer |
$\div$ algebras / 6.3: |
Some classes $Z(P_{\sigma}, P_{\tau})$ / 6.4: |
Circulants and their generalizations / 6.5: |
The centralizer of $J$; magic squares / 6.6: |
Kronecker products of $I, \pi$, and $J$ / 6.7: |
Best approximation by elements of centralizers / 6.8: |
Appendix |
Bibliography |
Index of authors |
Index of subjects |
An Introductory Geometrical Application |
Nested triangles / 1.1: |
The transformation $\sigma$ / 1.2: |