Sh4pe

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681 reputation

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visits	member for	1 year, 9 months
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38 Questions

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8	Is every open, bounded and simply connected subset of $\mathbb{R}^n$ essentially a ball?
7	Is the Laplacian surjective on $C_0^{\infty}$?
6	Counterexample for the solvability of $-\Delta u = f$ for $f\in C^2$
6	Kernel of the product $A\otimes A\rightarrow A$
5	Parallelogram law valid in banach spaces?

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681 Reputation

+18	Good metric on $C^k(0,1)$ and $C^\infty(0,1)$
+30	Counterexample for the solvability of $-\Delta u = f$ for $f\in C^2$
+10	Do we really need Hahn-Banach that much?
+5	Is every open, bounded and simply connected subset of $\mathbb{R}^n$ essentially a ball?

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7 Answers

votes activity newest

2	Find a bijection between the Cartesian Product $[m] \times [n]$ and $[m n]$
2	The role of maps in algebraic structures?
1	Good metric on $C^k(0,1)$ and $C^\infty(0,1)$
1	Image of a Linear Operators Eigenspace
0	a matrice that becomes zero when multiplied with its factor

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40 Tags

3 linear-algebra × 6	1 general-topology × 2
2 abstract-algebra × 6	1 eigenvectors
2 elementary-set-theory	0 functional-analysis × 12
1 real-analysis × 4	0 sobolev-spaces × 5
1 metric-spaces × 2	0 banach-spaces × 4

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$Mathematics Stack Exchange$	Mathematics	681 rep	18
	Stack Overflow	401 rep	14

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