Henrique Tyrrell

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243 reputation

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visits	member for	1 year, 7 months
	seen	Apr 11 at 18:43
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Master's degree on the way.

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11 Questions

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5	Open Problems list
5	Find an abelian infinite group such that every proper subgroup is finite
2	Is $A_n$ characteristic in $S_n$?
2	Does the Sorgenfrey Line have a group operation compatible with its order topology?
1	Pappus's theorem

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243 Reputation

+5	Open Problems list
+25	Find an abelian infinite group such that every proper subgroup is finite
+10	Accumulation points: an example of a sequence that has exactly two accumulation points
+5	Is $A_n$ characteristic in $S_n$?

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9 Answers

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3	Bijection for a function $ \mathbb{Z}^+ \times \mathbb{Z}^+$ to $\mathbb{Z}^+ $
2	Proof, is $\forall x : (P(x) \lor Q(x)) \Leftrightarrow \forall x : P(x) \lor \forall x : Q(x)$?
2	Is the function $f(x) = (x^2, \sin x)$ onto or one-to-one?
1	Accumulation points: an example of a sequence that has exactly two accumulation points
1	Precise definition of the boundary set

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23 Tags

5 logic × 2	1 general-topology × 3
5 elementary-set-theory × 2	1 geometry × 2
3 homework × 8	1 triangle
2 functions	1 sequences-and-series
1 real-analysis × 4	0 group-theory × 3

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$Mathematics Stack Exchange$

Mathematics

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