Linear algebra, modules annihilator
4295
Let $N$, $K$ be sub-modules of $M$ with $I=\mathrm{Ann}(N)$, $J=\mathrm{Ann}(K)$. Show $I+J$ is a proper subset of $\mathrm{Ann}(N \cap K)$.
70606
Show that the LU decomposition of matrices of the form $\left[\begin{smallmatrix}0& x\\0 & y\end{smallmatrix}\right]$ is not unique
35247
The characteristic and minimal polynomial of a companion matrix
138672
Finding Ideals in $\begin{bmatrix} \mathbb{Q} & \mathbb{Q}\\ 0 & 0 \end{bmatrix}$
11375
Jacobson radical of a certain ring of matrices
64353
Does the set of matrix commutators form a subspace?
131503
Image of dual map is annihilator of kernel
128489
Linearly independent elements are less than generators in a module.
98949
Subspaces and annihilators
25430
When is matrix multiplication commutative?
93550
How to find the matrix representation of an operator from its action on a basis?
96158
What's the associated matrix of this linear operator?
62614
How to get matrix $A$ from $A^\top A=B$ with given symmetric matrix $b$?
44898
Help with commutative property of matrices problem
41860
Linear Transformation and Matrices
42141
Proving Distributivity of Matrix Multiplication
61304
Normal ordering of the commutator between annihilation and creation operator