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1h
revised Stieltjes integral with discontinuous integrator
added 51 characters in body
23h
comment Is the product of a Schwartz function and a locally integrable function integrable?
@DanielFischer Thank you!
23h
revised Is the product of a Schwartz function and a locally integrable function integrable?
added 108 characters in body
23h
answered What is the mean value theorem for the Fréchet (total) derivative?
23h
answered Is the product of a Schwartz function and a locally integrable function integrable?
May
14
answered Find the set of all cluster points
May
13
comment Palais–Smale compactness condition
Many people call it "(PS) condition" actually. The point is that compactness is probably the most important ingredient in calculus of variations, and this condition is weaker than the compactness of the space/manifold as in baby Morse theory one assumes.
May
11
revised Proving function is $C^k$
edited body
May
11
revised Prove that the series is continuous and differentiable
added 1 character in body
May
11
comment References for the operator $(I-\Delta)^{\alpha /2}$
@Jose27 Yes, basically the linear theory on which one tries to build a nonlinear theory for equations like $(I-\Delta)^{\alpha /2}u = f(u)$.
May
10
comment References for the operator $(I-\Delta)^{\alpha /2}$
@Jose27 Yes, Stein's book is the first attempt that I made. But I am looking for a more... PDE oriented approach. For the operator $(-\Delta)^{\alpha/2}$ there are now several surveys, but it seems to me that for the (more regular) $(I-\Delta)^{\alpha/2}$ we have to look for lemmas in old papers.
May
9
asked References for the operator $(I-\Delta)^{\alpha /2}$
May
9
comment Prove $\lim b_{n}=0$
If an answer solves your problem, you should accept it or, at least, upvote it...
May
9
comment Prove $\lim b_{n}=0$
Pick $\epsilon = \frac{1}{2}$ in the definition of $\lim_{n \to +\infty} a_n = 1$.
May
9
answered Prove $\lim b_{n}=0$
May
8
revised Why are both of the conditions of Bolzano -Weierstrass theorem necessary?
edited title
May
7
revised Differences between quiver 1→2 and quiver 1→3←2
added 26 characters in body
May
6
comment Particular solution of a second order differential equation
You have $u=y'$ and you need $y$. Therefore...
May
6
answered How does the value of a functional change when you perturb the extremizing function?
May
6
answered Initial value problem-Picard's conditions