David Toth

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cs student

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29 Questions

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8	Can we expand numbers on the left to produce irrational numbers?
6	If $S_n$ is a symmetric group, what is the name for $n$?
5	What is $\aleph_0$ powered to $\aleph_0$?
4	What is the automorphism group of $\mathbb{R}$ under addition? [duplicate]
3	$\pi_1(X)$ finite, show $f:X \to S^1$ is nullhomotopic

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530 Reputation

+5	Torus interior homeomorphic to torus exterior
+10	Let $A$ be a set, $R$ an empty relation on $A$, what is $A/R$?
+5	Is $r:S^1 \to \{x_0\}$ a retraction?
+5	$\pi_1(X)$ finite, show $f:X \to S^1$ is nullhomotopic

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1 Answer

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0	Attempt to prove that every subgroup is an equalizer

35 Tags

0 algebraic-topology × 11	0 notation × 2
0 group-theory × 6	0 set-theory × 2
0 category-theory × 3	0 cardinals × 2
0 elementary-set-theory × 2	0 axioms × 2
0 abstract-algebra × 2	0 definition

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7 Accounts

$Mathematics Stack Exchange$	Mathematics	530 rep	16
	Computer Science	231 rep	6
	Super User	118 rep	5
	Geographic Information Systems	106 rep	1
	Theoretical Computer Science	101 rep

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