List questions from symmetric-matrices

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List Question

Representing antisymmetric matrix in block diagonal form?

quadratic form inequality for SPD matrices

Skew-symmetric matrices and invariants

Eigenvalues of a $20 \times 20$ symmetric matrix

Symmetric $S$ in $S^{-1}AS = A^T$

Determining if a symmetric matrix is positive definite

Show that all the conics o tangential in $[1,0,0]$ on the line $x_1=0$, is a 3D subspace of $\mathbb{P}(Sym_{\mathbb{R}}(3))$

SVD of $H^TXH$ with SVD of $X$ known

What are the conditions for the existence of a special orthogonal similarity transformation?

Upper bound for spectral radius of matrix multiplications

How is this a linear matrix inequality?

Unit norm eigenvectors of a symmetric matrix

Find a positive-definite scalar product for which $F:\mathbb{R^3}\to \mathbb{R^3}$ is symmetrical

Diagonal elements of a symmetric matrix and positive definiteness

Adding matrices to their transpose

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