430 reputation
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visits member for 1 year, 7 months
seen Aug 5 at 19:50

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
28
comment Indefinite integral $\int x^{\frac{3}{2}} \cos{x}dx$
@DonAntonio: No. I know that this problem has a solution by means power series. I'm interested that Is this problem has a explicit sou lotion,without series...
Apr
28
asked Indefinite integral $\int x^{\frac{3}{2}} \cos{x}dx$
Apr
27
suggested suggested 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?
Mar
18
asked Is $S=\{(x,y)\in[0,1]\times[0,1]:x,y\in\mathbb Q\}$ Lebesgue measurable?