User Sputnik - Mathematics Stack Exchange

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visits	member for	2 years, 1 month
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	1,063 reputation	bio	website	Soon	visits	member for	2 years, 1 month
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5

votes

3

answers

221

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If $n\neq m$ then $\mathbb{R}^n$ is not homeomorphic to $\mathbb{R}^m$

general-topology algebraic-topology

jun 15 at 11:50 Seirios 9,725

4

votes

1

answer

305

views

Number of 3-torsion points on an elliptic curve

elliptic-curves

jun 16 '12 at 3:59 Eugene 3,733

2

votes

1

answer

173

views

Isomorphism between a quotient group and the 2-torsion subgroup

group-theory finite-groups abelian-groups

feb 8 '12 at 22:27 Arturo Magidin 159k

2

votes

3

answers

752

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About maps between homology groups

algebraic-topology homology

dec 22 '11 at 9:10 Grigory M 7,650

1

8

votes

2

answers

823

views

Painting the faces of a cube with distinct colours

combinatorics group-theory

sep 15 '11 at 21:45 André Nicolas 168k

1

vote

1

answer

149

views

Simple combinatorics - tiling shapes with dominoes

combinatorics

aug 31 '11 at 0:04 Henning Makholm 53.9k

2

votes

1

answer

261

views

Birationally equivalent elliptic curves

elliptic-curves

aug 18 '11 at 13:50 Álvaro Lozano-Robledo 5,398

3

votes

1

answer

131

views

The $p$-adic expansion of a function of $p$

number-theory p-adic-number-theory

jun 11 '11 at 4:06 Zev Chonoles 57.6k

0

votes

1

answer

97

views

Does $f \sim g$ imply $f \asymp g$ in certain conditions?

notation asymptotics analytic-number-theory

jun 10 '11 at 17:12 MartianInvader 1,916

1

8

votes

3

answers

202

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Can one show that $\sum_{n=1}^N\frac{1}{n} -\log N - \gamma \leqslant \frac{1}{2N}$ without using the Euler-Maclaurin formula?

number-theory sequences-and-series analytic-number-theory

jun 9 '11 at 18:23 André Nicolas 168k

2

votes

1

answer

153

views

Intuition behind elliptic curves and $K$-rational points

intuition elliptic-curves

jun 8 '11 at 19:56 Jeff 1,112

3

votes

1

answer

312

views

A little help on the homology of a torus relative to a circle

algebraic-topology

jun 5 '11 at 16:59 wckronholm 1,215

2

votes

1

answer

130

views

A quotient group and its torsion elements

group-theory abelian-groups

jun 2 '11 at 16:14 Arturo Magidin 159k

1

3

votes

3

answers

193

views

Conjugation is not expressible in terms of polynomials

matrices algebraic-geometry

may 31 '11 at 18:23 lhf 36.1k

0

votes

1

answer

150

views

Does this correctly show that the union of infinite affine varieties is not an affine variety?

algebraic-geometry

may 31 '11 at 14:28 Qiaochu Yuan 121k

6

votes

3

answers

109

views

A type of isomorphism on $\mathbb{Z}^r$

group-theory

may 30 '11 at 13:25 Derek Holt 8,853

0

votes

1

answer

145

views

Why is this isomorphic to the reduced homology group?

algebraic-topology homology

may 29 '11 at 14:54 Grigory M 7,650

1

4

votes

2

answers

556

views

Property of abelianization

group-theory abelian-groups

may 22 '11 at 19:33 Arturo Magidin 159k

1

vote

1

answer

154

views

Does abelianization change the rank of $\pi_1(X)$?

algebraic-topology abelian-groups

may 20 '11 at 17:19 Chris Eagle 21k

1

5

votes

1

answer

565

views

The simplest $\Delta$-complex structure on $S^2$

algebraic-topology intuition

may 19 '11 at 21:05 Sputnik 1,063

11

32

votes

3

answers

1

kviews

The direct sum $\oplus$ versus the cartesian product $\times$

group-theory abelian-groups

may 19 '11 at 16:07 Arturo Magidin 159k

1

8

votes

1

answer

267

views

The Mayer-Vietoris sequence

algebraic-topology intuition

may 18 '11 at 3:18 Mariano Suárez-Alvarez♦ 54.3k

6

votes

1

answer

113

views

Do we have to use Bernoulli polynomials in the Euler-Maclaurin summation formula?

classical-analysis

may 18 '11 at 2:42 joriki 93.6k

0

votes

1

answer

185

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Definition of a subcomplex of a $\Delta$-complex

algebraic-topology definition

may 17 '11 at 22:00 Mariano Suárez-Alvarez♦ 54.3k

6

votes

1

answer

193

views

Nitpicky question about harmonic series

sequences-and-series divergent-series

may 7 '11 at 2:17 Ｊ. M. 39.9k

5

votes

5

answers

369

views

A polynomial that is zero on an open set

general-topology polynomials

may 4 '11 at 18:47 Qiaochu Yuan 121k

Sputnik

26 Questions