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705 Answers

newest activity votes
27
What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
27
Stuck trying to prove an inequality
20
If $e^A$ and $e^B$ commute, do $A$ and $B$ commute?
14
Are there real-life relations which are symmetric and reflexive but not transitive?
13
A problem on Condition $\det(A+B)=\det(A)+\det(B)$
10
Looking for an intuitive explanation why the row rank is equal to the column rank for a matrix
10
When will PageRank fail?
9
Bounded functions have bounded derivatives.
8
Calculating the eigenvalues of a matrix
8
$ABCD = I$ then $B^{-1} =?$
8
for a $3 \times 3$ matrix A ,value of $ A^{50} $ is
8
Find the determinant of $A$ satisfying $A^{-1}=I-2A.$
8
Apostol Calculus I Section 11.7 # 9 - Radius of Convergence
7
Relation between positive definite Hermitian matrices with their inverses
7
Order of matrices
7
How to show that there exists a root of $f(x)=0$?
7
Matrix Determinant
7
Determinant of a special skew-symmetric matrix
7
Find polynomials such that $(x-16)p(2x)=16(x-1)p(x)$
6
Is this set a Vector Space or not?
6
The matrix I mentioned below is irreducible and primitive or isn't?
6
Trace minimization with constraints
6
Spectral radius inequality
6
Is the hypercube graph $\{0,1\}^k$ bipartite?
6
Characteristic polynomial of a matrix with zeros on its diagonal
6
Show that, for $t>0$, $\log t$ is not a polynomial.
6
Does $u v^T + v u^T$ have exactly one positive and one negative eigenvalue when $u \not \propto v$?
6
$A$ is normal and nilpotent, show $A=0$
6
eigenvalues of certain block matrices
6
Is there a function with a removable discontinuity at every point?
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