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References to 'diagonal'
1. a few complex multiplication tables by PrimeFan
2. AB is conjugate to BA by Algeboy
3. adjacency matrix by CWoo
4. affine transformation by matte
5. Algebraic K-theory by mhale
6. alternating form by CWoo
7. an application of Z-matrix in a mobile radio system by kshum
8. base and height of triangle by pahio
9. Bell's triangle by PrimeFan
10. bicyclic semigroup by mclase
11. Bondy and Chv\'atal theorem by drini
12. Brianchon theorem by vmoraru
13. characteristic matrix of diagonal element cross-section by lars_h
14. Cholesky decomposition by gufotta
15. chromatic polynomial by bbukh
16. colorings of plane graphs by marijke
17. colouring problem by vampyr
18. commensurable numbers by pahio
19. commuting matrices by Algeboy
20. compass and straightedge construction of regular pentagon by Wkbj79
21. conjugate diameters of ellipse by pahio
22. corollary of Schur decomposition by Daume
23. covariance matrix by CWoo
24. criterion for constructibility of regular polygon by Wkbj79
25. crossed quadrilateral by pahio
26. determinant by rmilson
27. determinant inequalities by Andrea Ambrosio
28. diagonal embedding by waj
29. diagonal functor by CWoo
30. diagonal matrix by rspuzio
31. diagonal quadratic form by CWoo
32. diagonalization by rmilson
33. diagonalization of quadratic form by rspuzio
34. enumerating graphs by Algeboy
35. equitable matrix by matte
36. equitable matrix for money exchange by mathforever
37. equivalent condition for being a fundamental system of entourages by mps
38. Euclidean distance matrix by mathcam
39. example of Banach algebra which is not a $C^*$-algebra for any involution by asteroid
40. example of cylindric algebra by CWoo
41. example of non-diagonalizable matrices by cvalente
42. Fibonacci jigsaw puzzle by PrimeFan
43. finite projective plane by Mathprof
44. Franklin magic square by PrimeFan
45. functional calculus for Hermitian matrices by mathcam
46. fundamental complexity diagrams by bci1
47. fundamental system of entourages by mps
48. generalized Cartan matrix by bwebste
49. generating function for the Catalan numbers by rm50
50. Gershgorin's circle theorem by lieven
51. groupoid and group representations related to quantum symmetries by bci1
52. Hadamard product by bbukh
53. harmonic mean by drini
54. harmonic mean in trapezoid by pahio
55. Hartogs triangle by jirka
56. Hermitian matrix by matte
57. hexagon by Wkbj79
58. Hosoya's triangle by PrimeFan
59. hyperbola by pahio
60. If $A \in M_n(R)$ and $A$ is supertriangular then $A^n=0$ by Daume
61. integer partition by rm50
62. Iwasawa decomposition by mathwizard
63. Jacobi's theorem by Koro
64. Jordan canonical form theorem by Mathprof
65. Kempe chain by marijke
66. kite by yark
67. Klein 4-group by Algeboy
68. knot theory by CWoo
69. K\"onig's theorem by yark
70. lattice paths and ballot numbers by rm50
71. lecture notes on determinants by rmilson
72. lecture notes on the Cayley-Hamilton theorem by rmilson
73. Leibniz harmonic triangle by PrimeFan
74. M-matrix by kshum
75. magic constant by PrimeFan
76. magic square by drini
77. matrix ring by CWoo
78. midpoint by Mathprof
79. minimal polynomial (endomorphism) by mathcam
80. Minkowski space by cvalente
81. module-finite extensions are integral by rm50
82. multidimensional Gaussian integral by Mathprof
83. multiply transitive by bwebste
84. Newton's line by vmoraru
85. Newton-Gauss line by vmoraru
86. nilpotent matrix by jgade
87. nilpotent transformation by rmilson
88. non-commuting graph by GrafZahl
89. nonabelian group by drini
90. normal matrix by Daume
91. number of unrooted labeled trees by rm50
92. off-diagonal entry by mathcam
93. Ore's theorem by Koro
94. parallelogram by drini
95. parallelogram law by drini
96. parallelogram principle by pahio
97. parallelogram theorems by pahio
98. parameterization of equitable matrices by rspuzio
99. partial ordering in a topological space by CWoo
100. Pascal's triangle by Koro
101. path by CWoo
102. pentagon by rspuzio
103. pentagram by pahio
104. permanent by marijke
105. perspectivity by CWoo
106. polynomial identity algebra by CWoo
107. poset by mps
108. primitive matrix by Mathprof
109. product of automata by CWoo
110. proof of determinant of the Vandermonde matrix by rspuzio
111. proof of generalized Ruiz's identity by GeraW
112. proof of Hadamard's inequality by Andrea Ambrosio
113. proof of Mantel's theorem by mps
114. proof of parallelogram law by Mathprof
115. proof of parallelogram theorems by rm50
116. proof of properties of trace of a matrix by Daume
117. proof of Schur's inequality by Andrea Ambrosio
118. proof of von Neumann double commutant theorem by asteroid
119. proof of Wielandt-Hoffman theorem by Andrea Ambrosio
120. proof that $\det e^A = e^{\operatorname{tr}A}$ by cvalente
121. properties of diagonally dominant matrix by Andrea Ambrosio
122. properties of parabola by pahio
123. properties of regular tetrahedron by pahio
124. pseudo-Riemannian manifold by cvalente
125. pseudoinverse by akrowne
126. Ptolemy's theorem by drini
127. quantum operator algebras in quantum field theories by bci1
128. quasipositive matrix by Mathprof
129. Ramsey numbers by wdsmith
130. Rayleigh-Ritz theorem by gufotta
131. rectangle by drini
132. regular element of a Lie algebra by benjaminfjones
133. resultant (alternative treatment) by Mathprof
134. Rhind Mathematical Papyrus by milogardner
135. rhombus by yark
136. rule of Sarrus by pahio
137. Schur decomposition by Daume
138. separated scheme by djao
139. separated uniform space by CWoo
140. similarity and analogous systems: dynamic adjointness and topological equivalence by bci1
141. simultaneous block-diagonalization of upper triangular commuting matrices by lars_h
142. simultaneous triangularisation of commuting matrices over any field by lars_h
143. simultaneous upper triangular block-diagonalization of commuting matrices by lars_h
144. singular value decomposition by akrowne
145. skew-Hermitian matrix by matte
146. skew-symmetric matrix by Daume
147. Smith normal form by Mathprof
148. square by drini
149. square root of 3 by PrimeFan
150. Steinberg group by dublisk
151. strain transformation by CWoo
152. strictly upper triangular matrix by Daume
153. Sylvester's law by rspuzio
154. table of addition up to 12 by PrimeFan
155. table of division up to 12 by PrimeFan
156. table of multiplication up to 12 by PrimeFan
157. table of subtraction up to 12 by PrimeFan
158. theorem for normal triangular matrices by Mathprof
159. Thomassen's theorem on $3$-connected graphs by Mathprof
160. Toeplitz matrix by akrowne
161. topic entry on real numbers by matte
162. trace by mhale
163. trace of a matrix by Daume
164. transpose by mathcam
165. triangular matrix by Wkbj79
166. two isomorphic groups by Wkbj79
167. Ulam spiral by PrimeFan
168. uniform space by mps
169. uniformities on a set form a complete lattice by mps
170. unit triangular matrix by Daume
171. vector identities by mark_t314159
172. zero by Mravinci