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Top Questions
17
votes
What is the volume of the $3$-dimensional elliptope?
integration
volume
lmis
spectrahedra
semialgebraic-geometry
asked Oct 16 '16 at 15:49
math.stackexchange.com
11
votes
Why was the Soviet Naval Infantry disbanded in 1947?
military
soviet-union
cold-war
reference
infantry
asked Apr 12 '20 at 17:16
history.stackexchange.com
9
votes
Prove that $\nabla_{\mathrm X} \mbox{tr} (\mathrm A \mathrm X^{-1} \mathrm B) = - \mathrm X^{-\top} \mathrm A^\top \mathrm B^\top \mathrm X^{-\top}$
matrices
derivatives
matrix-calculus
trace
scalar-fields
asked Sep 19 '16 at 18:07
math.stackexchange.com
8
votes
Why don't rollbacks count as activity in my network profile?
support
network-profile
recent-activity
rollbacks
asked Sep 5 '20 at 22:34
meta.stackexchange.com
7
votes
Writing a convex quadratic program (QP) as a semidefinite program (SDP)
optimization
convex-optimization
quadratic-programming
semidefinite-programming
lmis
asked Apr 28 '17 at 13:22
math.stackexchange.com
6
votes
Where are the patronymic surnames of Hebraic origin?
origem-histórica
mudancas-históricas
nomes
história
asked Feb 14 '17 at 12:20
portuguese.stackexchange.com
5
votes
What theorem in topology was Claude Shannon referring to?
general-topology
continuity
signal-processing
information-theory
asked Mar 2 '19 at 19:51
math.stackexchange.com
5
votes
On the legality of replacing international transfers with intranational ones
banking
money
ixl
money-laundering
asked Sep 9 '20 at 10:32
law.stackexchange.com
Top Answers
81
Is “The empty set is a subset of any set” a convention?
math.stackexchange.com
75
Why are some coins Reuleaux triangles?
math.stackexchange.com
51
The relation between trace and determinant of a matrix
math.stackexchange.com
39
How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell?
math.stackexchange.com
30
What is a real-world metaphor for irrational numbers?
math.stackexchange.com
22
Derivative of squared Frobenius norm of a matrix
math.stackexchange.com
21
Are there any issues with speaking Spanish as a tourist in Portugal?
travel.stackexchange.com
20
Are two sequences equal if the sums and sums of squares are equal?
math.stackexchange.com
19
Systems of linear equations: Why does no one plug back in?
math.stackexchange.com
16
Write $(x^2 + y^2 + z^2)^2 - 3 ( x^3 y + y^3 z + z^3 x)$ as a sum of (three) squares of quadratic forms
math.stackexchange.com
16
Decomposition of a positive semidefinite matrix
math.stackexchange.com
15
Legality of downloading books from websites such as Library Genesis
academia.stackexchange.com
15
Math without pencil and paper
math.stackexchange.com
15
Can a helicopter carry a large airplane?
aviation.stackexchange.com
14
Is $f(x,y) = f(\mathbf{x})$ abuse of notation?
math.stackexchange.com
13
Approximation to unsolvable system of equations
math.stackexchange.com
13
Suppose $M$ is an $m \times n$ matrix such that all rows and columns of $M$ sum to $1$. Show that $m=n$
math.stackexchange.com
12
Analytical solution for kinetics of bimolecular reaction
chemistry.stackexchange.com
12
Determinant of a $k \times k$ block matrix
mathoverflow.net
12
Calculating matrix exponential
math.stackexchange.com
11
Filling $4 \times 4$ matrix with Boolean values
math.stackexchange.com
11
Find large power of a non-diagonalisable matrix
math.stackexchange.com
11
Why do positive definite matrices have to be symmetric?
math.stackexchange.com
10
Establishing authority in the classroom
academia.stackexchange.com
10
Decomposing a matrix into a product of sparse matrices
mathoverflow.net
10
Applications of mathematics in clinical setting
mathoverflow.net
10
Find the determinant of $I + A$
math.stackexchange.com
10
What are the possible concentration pathways for a 3-species system?
chemistry.stackexchange.com
10
Why do market-makers usually win against traders?
money.stackexchange.com
9
Why is it not possible to generate an explicit formula for Newton's method?
math.stackexchange.com
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