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21h
accepted The compactness of $\{x_n=cos nt\}_{n\in\mathbb{N}}\in L_2[-\pi,\pi]$
21h
revised The compactness of $\{x_n=cos nt\}_{n\in\mathbb{N}}\in L_2[-\pi,\pi]$
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22h
revised $C^1 [0,1]$ with different norm
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22h
revised The compactness of $\{x_n=cos nt\}_{n\in\mathbb{N}}\in L_2[-\pi,\pi]$
deleted 12 characters in body
22h
revised f continuous and goes to $0$ at $\infty$ then$f\in L^1 (R)$
deleted 4 characters in body
22h
revised $C^1 [0,1]$ with different norm
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22h
revised The contraction function
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22h
accepted The contraction function
22h
revised The subspace of $\ell_2$
deleted 91 characters in body
1d
accepted The isomorphism of $\mathbb{Z}_4\times\mathbb{Z}_2$ and symmetry group of square
1d
asked The isomorphism of $\mathbb{Z}_4\times\mathbb{Z}_2$ and symmetry group of square
2d
awarded  Popular Question
Sep
14
asked The closed set in the product topology
Sep
9
comment The closure of $A=\{x\times\frac{1}{2}|0<x<1\}$
@QuangHoang when I read the comment for the previous one, I get so confused, since $\overline{A\times B}=\overline{A}\times\overline{B}$
Sep
9
comment The closure of $A=\{x\times\frac{1}{2}|0<x<1\}$
@Surb ordered square topology
Sep
9
asked The closure of $A=\{x\times\frac{1}{2}|0<x<1\}$
Sep
9
asked The closure of $\{x\times0\mid 0<x<1\}$
Sep
7
comment The definition of the basis of the topology
@AndreasBlass but in topology we don't usually need to consider the shape right?
Sep
7
asked The definition of the basis of the topology
Sep
3
asked The definition of compact set without using open cover