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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

1 vote
1 answer
2k views

Lipschitz functions and $W^{1,\infty}$

I am not sure my question is research type, but I am sure I can find here an answer. So we have the following theorem in the book of Lawrence Evans in PDE, 2nd edition pages 294-295: Theorem 4 (C …
Alan's user avatar
  • 1,594
1 vote
0 answers
80 views

boundedness of a sequence $ \in L^{\infty}(I,H^1(M))\cap Lip(I,L^2(M))$ implies that its tem... [closed]

Hi I have the next claim which I would like to find a proof of it. I have a sequence of functions $u_\epsilon(t,x) \in H^1(M)$ where $M$ is a compact manifold, and $u_\epsilon \in L^\infty(I,H^1(M))\ …
Alan's user avatar
  • 1,594
0 votes
1 answer
260 views

Banach space dual to $L^\infty(I,H^1(M))$

What is the dual to $L^\infty (I,H^1(M))$?, where $I$ is an interval in the real line; $H^1(M)$ is Sobolev space of degree 1, and $M$ is a compact manifold like the torus. Any references that show th …
Alan's user avatar
  • 1,594
5 votes
0 answers
236 views

Is Akcoglu's theorem for power bounded positive operators still an open problem?

I am reading Ulrich Krengel's book, Ergodic Theorems; the theorem of Akcoglu's he mentions of is on page 189, theorem 2.5. " If $T$ is a positive contraction in a space $L_p$ with $1<p<\infty$, then: …
Alan's user avatar
  • 1,594
-1 votes
1 answer
128 views

Proving convergence of an integral-differential equation [closed]

I have a second order nonlinear ordinary differential equation which I transformed into an integral-differential equation by multiplying the ODE by $y'$ and integrating. My question is where can I fi …
Alan's user avatar
  • 1,594