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davcha's user avatar
davcha
  • Member for 9 years, 9 months
  • Last seen more than 1 year ago
25 votes

Outer Product of Two Matrices?

14 votes
Accepted

Why Laplacian Matrix need normalization and how come the sqrt of Degree Matrix?

10 votes

Approximate the second largest eigenvalue (and corresponding eigenvector) given the largest

6 votes
Accepted

Why does the set of positive definite matrices define a half-space?

5 votes
Accepted

Commute time distance in a graph

4 votes
Accepted

How to get matrix $A$ from $A^\top A=B$ with given symmetric matrix $b$?

3 votes

What would be an example of a magma such that $x\cdot(x\cdot x)\neq (x\cdot x)\cdot x$?

3 votes

Relation between the eigenvectors of $A$ and $A^TA$

3 votes

What is wrong with the following proof that tries to prove that $2=1$?

2 votes

Matrix inequality with maximum singular value

2 votes

Show $E\left(\mathbf{X}_i \otimes \mathbf{u}_i\right)=\mathbf{0}$ implies $E\left(\mathbf{X}_i^{\top}\mathbf{G}\mathbf{u}_i\right)=\mathbf{0}$

2 votes

Rank of a product between a full row and a full column rank matrix

2 votes

What is the upper bound for this 2-norm

2 votes

Why does gradient descent make sense?

2 votes

Arithmetic Overflow and Underflowing

1 vote

Transition matrix to graph

1 vote

Forming peaceful teams

1 vote

Motivations for Shi-Malik Algorithm

1 vote

Notation for a function with multiple return values

1 vote
Accepted

How can I show that $(a^\top \otimes b)(b^\top \otimes a) = (a \otimes b)(b \otimes a)^\top$?

1 vote
Accepted

Why $ (A\vec{x})'A \vec{x} = \vec{0}$ implies that $A\vec{x} = \vec{0}$

1 vote

How to solve linear system $A x= b$ when matrix $A$ is non-invertible?

1 vote

Maximize the value of $v^{T}Av$

1 vote

How to prove that the minimum eigenvalue of the difference of two specific matrices is negative

1 vote

Proving that $A$ is singular iff it's not injective

1 vote

How to find the largest connected component of an undirected graph using its incidence matrix?

1 vote

How to prove this product rule?

1 vote

What is the correct way to write this matrix equation?

0 votes

Determine vector which maximizes the given function

0 votes

derivative of a function including a vector