Reputation
2,549
Top tag
Next privilege 3,000 Rep.
Cast close & reopen votes
Badges
1 5 22
Newest
 Custodian
Impact
~23k people reached

Apr
29
reviewed No Action Needed Functional equation.
Apr
29
reviewed No Action Needed Quadratic inequality (Sign Reversal?)
Apr
29
reviewed No Action Needed Is this group given presentation isomorphic to $\mathbb{Z}_2$, and why?
Apr
29
reviewed Approve Proof by strong induction combinatorics problem
Apr
29
reviewed Approve Does this Condition on Exit Times imply $X_t$ is a Local Supermartingale?
Apr
29
reviewed No Action Needed Prove that if $A$, $B$, and $C$ are sets then $(A - B) \cup (A - C) = A - (B \cap C)$
Apr
25
revised Equivalent definition of harmonic functions
Removed unrelated harmonic-analysis tag
Apr
25
comment Prove by mathematical induction: $n! < n^n$ for $n\geq2$
Hint: $(n+1)^{(n+1)} = (n+1)(n+1)^n \geq (n+1)n^n$.
Apr
24
reviewed Approve Solving proportions with multiple variables.
Apr
24
comment Bounds on $L^2$ and $L^{\infty}$ norms in terms of $H^1$-seminorms for functions attaining a zero in a domain.
There are similar Poincare inequalities in higher dimensions that apply to functions that have trace $0$: en.wikipedia.org/wiki/Poincar%C3%A9_inequality.
Apr
24
answered Proving $\|[b,T](f)\|_{p}\le C\|b\|_{BMO(\mathbb{R}^{n})}\|f\|_{p}$ using the Fefferman-Stein inequality
Apr
17
reviewed Approve How can I get f(x) from its Maclaurin series?
Apr
17
reviewed Approve Can someone explain how the cartesian equation is formed?
Apr
17
reviewed Approve Finding the missing values in a trigonometric theoretical scenario? Rocket launch?
Apr
17
reviewed Approve Finding polynomial in modular? // $(n!)+1$ prime
Apr
16
reviewed Approve What functions satisfy $\int\limits_{-\pi}^\pi f(x)^2\,dx = \int\limits_{-\pi}^\pi f'(x)^2\,dx$
Apr
16
awarded  Custodian
Apr
16
reviewed Approve Convergence Of an Integral.
Apr
16
reviewed No Action Needed Let $D$ be a principal ideal domain. Show that every proper ideal of $D$ is contained in a maximal ideal of $D$.
Apr
12
comment Poincaré-like inequality
Should $\Omega$ be connected as well? What if $\Omega$ is disjoint two balls and $\Gamma^1$ and $\Gamma^2$ are the boundaries of the separate balls. With effectively no conditions on $\Gamma^2$, I don't see what stops $\xi = 0$ on the first ball and $\xi = C$ on the second ball.