Optimal Projectors in a trace involving positive definite matrices
50890
Trace after the action of projectors
133149
Inverse of a Positive Definite
68132
Small positive eigenvalues found for a negative definite matrix
12868
Is the product of symmetric positive semidefinite matrices positive definite?
35625
Direct sum of orthogonal subspaces
30268
Positive definite matrix must be Hermitian
124001
Are the eigenvalues of the sum of two positive definite matrices increased?
144357
Choose $\rho$ such that $\rho$-norm minimizes the matrix condition number
36775
Matrix semi-positive definite
119662
understanding projection matrices
135252
If $M$ is positive definite, then $\operatorname{det}{(M)}\leq \prod_i m_{ii}$
46076
Least Squares with $ {L}_{2} $ (L2) Linear Norm Regularization (Not Squared)
59402
Comparing Eigenvalues of Positive Semidefinite Matrices
102935
Trace and determinant of composition of a left-multiplication and a right-multiplication on a space of matrices
143869
Showing that the norm of the canonical projection $X\to X/M$ is $1$
132978
Matrix Calculus in Least-Square method
131589
Projections appropriate for global analysis that preserve area and that preserve distance (but not necessarily in the same projection)