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 Jan18 awarded Yearling Jul2 awarded Curious Jan18 awarded Yearling Jul19 awarded Teacher Jul6 accepted A question about Banach algebras: showing that $\operatorname{Sp}a \subset D_o \cup D_1$ Jul6 comment A question about Banach algebras: showing that $\operatorname{Sp}a \subset D_o \cup D_1$ @Daniel Fischer: $\operatorname{Sp}a = \{\lambda \in \mathbb{C}\colon \lambda\cdot e - a \text{ is not invertible}\}$ Jul6 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. Jul6 asked A question about Banach algebras: showing that $\operatorname{Sp}a \subset D_o \cup D_1$ May21 revised Topological manifold example added 2 characters in body May21 answered Topological manifold example May2 accepted Improper Integral:$\int_{0}^{+\infty}\frac{\sin x}{x+\sin x}dx$ May1 asked Improper Integral:$\int_{0}^{+\infty}\frac{\sin x}{x+\sin x}dx$ Apr27 suggested rejected edit on Definition of a submanifold Apr11 accepted Problem on $\operatorname{Hom}(\mathbb Z_6,R^*\oplus C^*)$ Mar25 awarded Peer Pressure Mar25 accepted Construct a measurable set in $[0, 1]$ with a property Mar25 asked Construct a measurable set in $[0, 1]$ with a property Mar18 accepted Is $S=\{(x,y)\in[0,1]\times[0,1]:x,y\in\mathbb Q\}$ Lebesgue measurable? Mar18 asked Is $S=\{(x,y)\in[0,1]\times[0,1]:x,y\in\mathbb Q\}$ Lebesgue measurable? Mar14 accepted Isomorphic Group with $G=(\mathbb Z_{2^\infty}\oplus \frac{\mathbb Q}{\mathbb Z}\oplus \mathbb Q)\otimes_{\mathbb Z}\mathbb Q$