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diimension
  • Member for 9 years, 11 months
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118 votes
2 answers
82k views

Prove that simultaneously diagonalizable matrices commute

37 votes
3 answers
54k views

Inverse of a Positive Definite

15 votes
5 answers
11k views

If a Matrix Has Only Zero as an Eigen-Value Then It Is Nilpotent

8 votes
3 answers
11k views

Gram Matrices Rank [duplicate]

6 votes
6 answers
14k views

Prove that if $A$ is invertible matrix then $AA^T$ and $A^T A$ are also invertible.

6 votes
2 answers
12k views

Singular value proofs

4 votes
4 answers
12k views

Positive Definite Matrix Determinant

4 votes
2 answers
11k views

Orthogonal Projection Proof

3 votes
1 answer
2k views

Linearly Independent Dot Product Proof

3 votes
1 answer
388 views

Matrix of Positive Definite

3 votes
1 answer
6k views

Diagonal Matrix Proof

3 votes
1 answer
7k views

Symmetric Matrix Proof

3 votes
1 answer
4k views

The zero vector

3 votes
1 answer
1k views

Determine if function lies within span of vector valued function

3 votes
4 answers
3k views

Orthonormal Projection Proof

3 votes
4 answers
6k views

Polynomial Orthogonal Complement

3 votes
1 answer
5k views

Complex Conjugate Eigenvectors Proof

3 votes
1 answer
205 views

Linear Algebra Proof

2 votes
1 answer
337 views

Branch of Mathematics correlating with Physics

2 votes
1 answer
1k views

Rodrigues Legendre Polynomial Proof

2 votes
1 answer
1k views

Prove that $A = A^T$ has a repeated eigenvalue iff $AJ = JA$ for a nonzero skew-symmetric matrix $J^T = -J \ne 0$

2 votes
1 answer
539 views

Conditions that define a subspace

2 votes
1 answer
530 views

Positive Definite Addition

2 votes
1 answer
361 views

Minkowski spacetime light cone

2 votes
1 answer
3k views

Prove that the even (odd) degree Legendre polynomials are even > (odd) functions of $t$.

2 votes
2 answers
2k views

Orthogonal Inner Product Proof

2 votes
1 answer
3k views

Proper Orthogonal Matrix

1 vote
2 answers
3k views

If $A$ is skew-symmetric, then $I-A$ is invertible and $Q = (I-A)^{-1}(I+A)$ is orthogonal

1 vote
1 answer
64 views

Least Squares Construction

1 vote
2 answers
230 views

Positive Definite Symmetric Matrices Proof