Are Hessian matrices always symmetric?
73084
Asymmetric Hessian matrix
144145
Symmetric $3\times 3$ Matrices - Base matrix
99600
Show that a 2x2 matrix A is symmetric positive definite if and only if A is symmetric, trace(A) > 0 and det(A) > 0
35278
Does equality of characteristic polynomials guarantee equivalence of matrices?
12047
Tensors which are symmetric and antisymmetric in overlapping groups
146405
Norm with symmetric positive definite matrix
58149
Working with symmetric polynomials
111366
Does there exist a symmetric matrix $A$ such that $2^{\sqrt{n}}\le |\operatorname{Tr}(A^n)|\le2020 \ \cdot 2^{\sqrt{n}}$ for all $n$
131611
$A^TA$ is always a symmetric matrix?
105293
Proof of the second symmetric derivative
11566
Similar matrices and minimal polynomial
107992
Bilinear form with symmetric "perpendicular" relation is either symmetric or skew-symmetric
90576
Symmetric matrix eigenvalues
27767
Are two matrices similar iff they have the same Jordan Canonical form?
22222
Properties of zero-diagonal symmetric matrices
153127
Is $U=V$ in the SVD of a symmetric positive semidefinite matrix?
154640
Do Diagonal Matrices Always Commute?