# Questions tagged [matrices]

Questions where the notion matrix has an important or crucial role (for the latter, note the tag matrix-theory for potential use). Matrices appear in various parts of mathematics, and this tag is typically combined with other tags to make the general subject clear, such as an appropriate top-level tag ra.rings-and-algebras, co.combinatorics, etc. and other tags that might be applicable. There are also several more specialized tags concerning matrices.

**12**

**1**answer

### Is the image of the map $A \to \bigwedge^k A$ closed over $\mathbb{R}$?

**2**

**0**answers

### How to solve the inverse problem of least-squares?

**2**

**1**answer

### Local distribution of sample covariance matrix when the number of observations/realisations is less than the matrix dimension

**8**

**0**answers

### Nonzero subdeterminants conjecture: has anybody seen this anywhere?

**25**

**2**answers

### Symmetric strengthening of the Cauchy-Schwarz inequality

**2**

**0**answers

### Real-rooted polynomials with coefficient constraints

**1**

**0**answers

### Classification of Maximal Rank Skew-Symmetric Matrices with Linear forms as entries

**6**

**2**answers

### Probability of a large random integer Matrix to have zero determinant

**1**

**1**answer

### On a condition for a matrix sum to be zero

**1**

**0**answers

### Matrix Sparsity Pattern

**4**

**2**answers

### Bound on sum of $n$th super-diagonal entries in a $2n$ by $2n$ PSD matrix

**2**

**0**answers

### The nonlinear operator defined as the commutator of a matrix and a nonlinear operator

**4**

**0**answers

### Totally Unimodular matrix edited from ordinary matrix

**7**

**1**answer

### Square root of a large sparse symmetric positive definite matrix

**0**

**0**answers

### transfer a relation from matrices to their cholesky decompositions

**4**

**0**answers

### An upper bound on the Jordan condition number of a matrix

**2**

**1**answer

### Solving a “reversed” Stein equation

**3**

**1**answer

### Convexity of the matrix mapping $X^{-2}$

**0**

**1**answer

### On the (qualitative) behavior of a coupled differential equation

**2**

**1**answer

### Rotatable matrix, its eigenvalues and eigenvectors

**3**

**0**answers

### Representation of a matrix ring

**1**

**0**answers

### On the basis of a finite dimensional vector space (revised)

**3**

**0**answers

### Diagonal elements of Hermitian matrices with given eigenvalues

**1**

**0**answers

### Depth bound of generating an matrix algebra

**0**

**0**answers

### L1 norm constraint on product of 2 matrix

**1**

**1**answer

### Is this totally unimodular family?

**5**

**2**answers

### Factoring a positive semidefinite matrix into binary matrices

**4**

**0**answers

### Maximizing a certain eigenvalue ratio

**4**

**1**answer

### A generalization of unsolvable equation $ab-ba=1$ in a Banach algebra

**0**

**0**answers

### Solutions to this equation of the form $A(t_1,t_2)x = b(t_2)$

**1**

**2**answers

### Solution of $\dfrac{d [\epsilon_i]}{dt} = (\beta \mathbf{A} -\delta \mathbf{I})\left[\epsilon_i\right] - \alpha \mathbf{B} \left[\epsilon_i^2\right]$

**5**

**1**answer

### higher order analogues of sylvester's law of inertia?

**1**

**0**answers

### identity involving spectral functions

**0**

**1**answer

### Searching for matrices with some property

**2**

**0**answers

### Eigenvalues of special sum of Hermitian matrices

**1**

**1**answer

### Rank of matrix n x m [closed]

**0**

**0**answers

### The algebraic connectivity of $P_n$, the path on $n$ vertices does not exceed $\frac{12}{n^2-1}$

**-2**

**1**answer

### Find a columns of matrix $A$ which form a basis of columns space of matrix $A$ [closed]

**2**

**2**answers

### Finding an adjacency matrix whose cube's diagonal is equal to a given vector

**1**

**1**answer

### SVD of two matrices A and B having the same right singular vectors?

**0**

**0**answers

### Symmetric Grothendieck inequality

**5**

**2**answers

### Nuclear norm as minimum of Frobenius norm product

**8**

**1**answer

### Distance from nonnegativity of some orthonormal vectors

**9**

**2**answers

### Do two dimensional representations with the same adjoint representation differ by a character?

**11**

**2**answers

### Inverse of a small submatrix

**1**

**1**answer

### Summation unknown notation [closed]

**2**

**1**answer

### An inequality regarding projection

**1**

**1**answer

### Upper bound on the number of non-zero entries of the product of sparse matrices

**2**

**1**answer

### Lower bound for rank of a matrix

**0**

**1**answer