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 Jan 8 accepted Property of $10\times 10$ matrix Sep 13 awarded Popular Question Jan 18 awarded Yearling Jul 2 awarded Curious Jan 18 awarded Yearling Jul 19 awarded Teacher Jul 6 accepted A question about Banach algebras: showing that $\operatorname{Sp}a \subset D_o \cup D_1$ Jul 6 comment A question about Banach algebras: showing that $\operatorname{Sp}a \subset D_o \cup D_1$ @Daniel Fischer: $\operatorname{Sp}a = \{\lambda \in \mathbb{C}\colon \lambda\cdot e - a \text{ is not invertible}\}$ Jul 6 comment A question about Banach algebras: showing that $\operatorname{Sp}a \subset D_o \cup D_1$ $Sp a$ means spectrum of a. And discs are closed. Jul 6 asked A question about Banach algebras: showing that $\operatorname{Sp}a \subset D_o \cup D_1$ May 21 revised Topological manifold example added 2 characters in body May 21 answered Topological manifold example May 2 accepted Improper Integral:$\int_{0}^{+\infty}\frac{\sin x}{x+\sin x}dx$ May 1 asked Improper Integral:$\int_{0}^{+\infty}\frac{\sin x}{x+\sin x}dx$ Apr 27 suggested rejected edit on Definition of a submanifold Apr 11 accepted Problem on $\operatorname{Hom}(\mathbb Z_6,R^*\oplus C^*)$ Mar 25 awarded Peer Pressure Mar 25 accepted Construct a measurable set in $[0, 1]$ with a property Mar 25 asked Construct a measurable set in $[0, 1]$ with a property Mar 18 accepted Is $S=\{(x,y)\in[0,1]\times[0,1]:x,y\in\mathbb Q\}$ Lebesgue measurable?