Are only symmetric matrices definite?
3408
Do positive semidefinite matrices have to be symmetric?
157570
is a one-by-one-matrix just a number (scalar)?
110200
Determinant of a Special Symmetric Matrix
131611
$A^TA$ is always a symmetric matrix?
123424
Must eigenvector be real?
153119
$x^TAx=0$ for all $x$ when $A$ is a skew symmetric matrix
146316
what is no. of positive eigen value of symmetric matrix A with some given relationship
80623
Must $S$ be a unitary matrix?
145396
Symmetric Matrix , Eigenvectors are not orthogonal to the same eigenvalue.
27767
Are two matrices similar iff they have the same Jordan Canonical form?
91409
Semi positive definite matrix is always positive definite matrix
119032
Is ${\bf x^TAx} \ge { a \bf x^Tx}$ for some $a>0$ not dependent on $\bf x$ if $\bf A$ is positive definite matrix?
21571
Why are real symmetric matrices diagonalizable?
52246
Is it possible Fisher information matrix be indefinite?
90576
Symmetric matrix eigenvalues
73677
If the matrix $A^3 = 0$, is $A$ singular?
46308
Simultaneous diagonlisation of two quadratic forms, one of which is positive definite