Eric Thoma
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 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.