Sunni

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seen Oct 16 '12 at 12:42
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59 Answers

newest activity votes
27
Is it true that $\lvert \sin z \rvert \leq 1$ for all $z\in \mathbb{C}$?
13
Is A diagonalizable?
11
Reference request: is mathematics discovered or created?
10
AB - BA. Singular or nonsingular?
7
Cauchy-Schwarz inequality and three-letter identities (exercise 1.4 from “The Cauchy-Schwarz Master Class”)
6
Matrix algebra question
6
Evaluating $\lim\limits_{x\to 0}(1+x)^{1/x}$?
4
Where to publish short notes?
4
If $A\ge0$ and $B\le 0$, are the eigenvalues of $AB$ non-positive?
4
Seriously: What is the inverse of this 2-by-2 matrix?
4
How to show that a “Big-Oh” set is a subset of another?
3
Proof $||A||_{p} < 1 \Rightarrow \lim\limits_{k \rightarrow \infty}{A^k} = 0$ for any $A \in \mathbb R^{n \times n}$
3
Does the infinite sum of $\frac{n+1}{\ln(n+1)}$ converge?
3
If $A$ and $B$ are positive-definite matrices, is $AB$ positive-definite?
3
Ptolemy's theorem. How to prove?
2
For what matrices $A$ and $B$ is $\operatorname{tr}(AB) = \operatorname{tr}(A)\operatorname{tr}(B)$?
2
A book for self-study of matrix decompositions
2
Difficulties in a proof by mathematical induction (involves evaluating $\sum r3^r$).
2
How to Derive a Double Angle Identity.
2
Positive semi-definite matrix
2
Is it true that any matrix can be decomposed into product of rotation,reflection,shear,scaling and projection matrices?
2
A symmetric inequality
2
Verifying an Inequality: $\left(\frac{n-1}{n}\right)^{n-1} \leq \left(\frac{n-k-1}{n-k}\right)^{n-k-1}$
2
How do I prove equality of x and y?
2
$A\in M_n(\mathbb{R})$ symmetric matrix , $A-\lambda I$ is Positive-definite matrix- prove: $\det A\geq a^n $
2
eigenvalues of certain block matrices
2
An inequality of inner product
2
Why Aren't “Similar” Matrices Actually the Same?
1
Deducing results in linear algebra from results in commutative algebra
1
Have spd $(A^TA)$ and $(B^TB)$, need $A^TB$.
1 2