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dinosaur
  • Member for 10 years, 11 months
  • Last seen more than 4 years ago
  • Europe
21 votes
2 answers
4k views

Why do we need semi-norms on Sobolev-spaces?

13 votes
1 answer
5k views

uniqueness of Hahn-Banach extension for convex dual spaces

11 votes
2 answers
2k views

projection theorem for Banach spaces

9 votes
1 answer
6k views

condition for curve on a sphere

8 votes
1 answer
1k views

$L^p$-space inclusions

7 votes
1 answer
5k views

convergence of sequence of random variables and cauchy sequences

7 votes
3 answers
1k views

dimension of space of polynomials

7 votes
1 answer
2k views

Why is $H^1 \neq H_0^1$?

5 votes
2 answers
253 views

curvature of curve in $\mathbb R^2$

5 votes
1 answer
1k views

plane of symmetrie leads to geodesic

4 votes
2 answers
1k views

zero of vector field with index 0

4 votes
1 answer
516 views

Sobolev embeddings

4 votes
2 answers
554 views

Inverse of identity operator not continuous

3 votes
1 answer
376 views

Introducing constraint $\int udx =0$ to variational formulation

3 votes
0 answers
975 views

Fourier transform of partial derivative

3 votes
1 answer
3k views

Proof that function is in $H^1$

3 votes
1 answer
101 views

Proving an identity

3 votes
1 answer
197 views

Show $\mathcal D_D$ is Dynkin system

3 votes
0 answers
61 views

show that $\lim_{n\to\infty} \mu^*(\sum_{k=1}^n A_k) = \mu^*(\sum_{k=1}^\infty A_k)$ for outer measure $\mu^*$

3 votes
1 answer
75 views

$\mu(A_i)>0$ for countably many $i$

2 votes
1 answer
199 views

FETI domain decomposition - kernel of local stiffness matrices

2 votes
2 answers
269 views

limit of sequence integrable

2 votes
0 answers
2k views

plane curves and osculating plane

2 votes
1 answer
242 views

Poisson's equation under translation and scaling

2 votes
1 answer
456 views

shape regular triangulations and Zlamal's condition

2 votes
2 answers
339 views

an $L^2$-estimate for finite element solutions

2 votes
1 answer
538 views

law of large numbers and renewal processes

2 votes
1 answer
882 views

quotient map surjective and linear

2 votes
1 answer
147 views

Why is $T:\ell^1\to(\ell^\infty)'$ isometric

2 votes
1 answer
870 views

separate convex and concave function by affine function