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Apr
24
answered Proving $\|[b,T](f)\|_{p}\le C\|b\|_{BMO(\mathbb{R}^{n})}\|f\|_{p}$ using the Fefferman-Stein inequality
Apr
11
answered Prove that $|k(x)|\le C|x|^{-n}$ under suitable hypothesis on $k\in\mathcal{C}^1(\Bbb R^n\setminus\{0\})$
Apr
9
answered Is the Cauchy principal value “invariant” under change of variables?
Apr
9
answered Strong convergence on the unit sphere of $l_2$
Feb
29
answered Implicit function theorem from PMA Rudin
Feb
29
answered A thief is stealing a password. He knows three constraints; at most how many attempts must he make before he guesses the password?
Feb
26
answered Showing that the following set is closed in $L^p$
Feb
23
answered If $u \in H^s(\mathbb{R}^n)$ for $s > n/2$, then $u \in L^\infty(\mathbb{R}^n)$?
Feb
22
answered Decay property of oscillatory integrals in $\mathbb{R}^n$
Feb
22
answered $L^p$ norm of certain trigonometric polynomials bounded by $L^p$ norm of second derivative
Feb
19
answered Interpretation of well-ordering theorem
Feb
14
asked $L^p$ norm of certain trigonometric polynomials bounded by $L^p$ norm of second derivative
Feb
7
answered If a group has no subgroups other than the identity and itself, then it is finite and is of prime order
Jan
31
answered Determing the number of possible March Madness brackets
Jan
13
answered every closed ball is compact
Jan
13
answered Transitive action on a finite set and group
Jan
6
answered Measure space and inclusion of $L^p$-spaces
Jan
3
answered order of automorphism group of an abelian group of order 75
Jan
3
answered Relationship between decay of Fourier transform and smoothness in $L^2$
Dec
28
answered $n$ distinguishable items into $b$ distinguishable bins (there's more to elaborate…)