Stefan Smith

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1,546 reputation

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	age	42
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51 Questions

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19	Prove that the set of $n$-by-$n$ real matrices with positive determinant is connected
12	smoothing a Sobolev function
11	Do you need the Axiom of Choice to assert that every real vector space has a norm?
8	is there a name for this function (parity of a finite sequence)?
8	Do you need the Axiom of Choice to accept Cantor's Diagonal Proof?

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1,546 Reputation

+15	looking for reference or nice proof of trig lemma
+5	smoothing a Sobolev function
+15	looking for reference for integral inequality
+10	How to use the Mean Value Theorem to find the “Contraction Constant”

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48 Answers

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6	Give two linearly independent $X_1,X_2 \in \mathbb{M}^{2 \times 2}(\mathbb{R})$ such that $L_A (X_1) = L_A (X_2) = 0$
5	looking for a norm inequality
5	assumed distance in metric spaces
3	If $E \subset \mathbb{R}$ is measurable with $m(E) > 0$, must it contain a closed interval?
3	Prove that $f$ is a contraction.

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71 Tags

10 linear-algebra × 15	5 inequality × 6
6 multivariable-calculus × 9	5 norm
6 real-analysis × 8	5 metric-spaces
6 sobolev-spaces × 8	3 calculus × 10
6 functional-analysis × 7	3 bounded-variation × 10

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$Mathematics Stack Exchange$	Mathematics	1,546 rep	316
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$TeX - LaTeX Stack Exchange$	TeX - LaTeX	128 rep	4

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