Kasper

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2,313 reputation

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visits	member for	5 months
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114 Questions

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24	Proof by contradiction vs Prove the contrapositive
23	About Euclid's Elements and modern video games
22	Does mathematics require axioms?
12	What is symmetric about the symmetric group? [duplicate]
8	How do I prove that a function is well defined?

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2,313 Reputation

+5	How do I prove that a function is well defined?
+13	$x^4+y^4 \geq \frac{(x^2+y^2)^2}{2}$
+5	Prove that every planar Euler graph has an Euler-cycle that doesn't crosses itself.
+5	Let $G$ be a planar (simple) graph with $m (≥2)$ edges and $f$ faces. Prove that $f ≤ \frac{2}{3} m$.

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23 Answers

votes activity newest

10	How do I rewrite -100+1/2 as the mixed number -99 1/2?
6	Infinite sets don't exist!?
5	Let $H_1,H_2$ be two subgroups of $G$. Show that $ G=H_1 \cup H_2 \implies G=H_1 \lor G=H_2 $
4	Function notation terminology
3	Finding a vector $v_3$ such that $\{v_1, v_2, v_3\}$ is a basis of $ℝ^3$

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65 Tags

10 abstract-algebra × 46	6 foundations × 2
10 fractions	6 set-theory
10 rational-numbers	5 group-theory × 40
6 logic × 6	5 homework × 26
6 elementary-set-theory × 3	4 functions × 5

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12 Accounts

$Mathematics Stack Exchange$	Mathematics	2,313 rep	323
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	213 rep	7
	Graphic Design	126 rep	2
	Mathematica	124 rep	4
	Stack Overflow	112 rep	4

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Constituent	Convention
Caucus	Organizer
Nice Question × 4	Popular Question
Suffrage	Enthusiast
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