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user269711
  • Member for 8 years, 8 months
  • Last seen more than 3 years ago
3 votes
1 answer
5k views

2-Norm of Non-Square Matrices

3 votes
1 answer
151 views

Laurent Series From Cracking the GRE (Mistake?)

3 votes
1 answer
41 views

Solution to $\mathbf{x}'=A\mathbf{x}$, with $A$ anti-symmetric implies $|\mathbf{x}|=|\mathbf{x}_0|$

2 votes
2 answers
773 views

Let $N, K$ be abelian and subgroups of $G$, with $N$ normal and $G=NK$. Is $G\cong N\times K$?

2 votes
2 answers
97 views

Proving $f(x)>0$ on $\mathbb{R}^+$ given that $f(0)=0$ and $f'(x)>f(x)$

2 votes
2 answers
109 views

Differentiability of $\Phi:{GL}_n(\mathbb{R})\rightarrow M_n(\mathbb{R})$, where $\Phi(X)=X^{-1}$

2 votes
1 answer
119 views

Confusion on Differential Operators and Notation

2 votes
3 answers
2k views

finding weird examples of continuous functions (or, maybe, they're tricks?)

2 votes
1 answer
90 views

Double Limit Swapping With Both Sum and Integral

1 vote
1 answer
367 views

Proving a Mapping Property Between Tempered Distributions and Schwartz Functions

1 vote
1 answer
64 views

Restricting Nested Quantifiers

1 vote
0 answers
42 views

Why is the Order of a Classical Symbol Well-defined?

1 vote
0 answers
64 views

f uniformly Lipschitz, integral from 0 to inf of |f(x)| < inf imply |f(x)| converges to 0 as x -> inf. [duplicate]

1 vote
3 answers
152 views

Contour Integral of $\int\limits_0^{2\pi}\frac{d\theta}{1+a\cos\theta}$ for $a^2<1$ (textbook wrong?)

0 votes
1 answer
1k views

Finding order of coset in quotient group

0 votes
2 answers
83 views

Convergence of $ (x^n)/n$ for $x \ge 0$

0 votes
1 answer
1k views

Odd and Even Fourier Series Extension of $f(x)=x$ on $[0,\pi]$

0 votes
1 answer
42 views

Showing something does not have a solution on an open interval (is my idea correct?)

0 votes
1 answer
211 views

Suppose $f : [a, b] \to \mathbb{R}$ is bounded and $f \in \mathcal{R}[c, b]$ for all $a < c < b$. Show $f \in \mathcal{R}[a, b]$.

0 votes
1 answer
90 views

Question on finding which $p$ a sequence converges in $L^p$

0 votes
1 answer
263 views

Proving Complex Function on Provided Unbounded Domain Has the Same Sup on Interior and Boundary

0 votes
2 answers
52 views

sequence and limit convergence proof help

0 votes
2 answers
84 views

Prove that $1/||S^{-1}||\leq ||S-T||$

0 votes
1 answer
417 views

Proving that $\gcd(2,1+\sqrt{-5})=1$ in $\mathbb{Z}[\sqrt{-5}]$