User Allen Hatcher

7 votes

Inverse cohomological isomorphisms

answered Sep 4, 2014 at 14:43

6 votes

A homology of p-covering space

answered Aug 21, 2011 at 18:25

6 votes

Accepted

Essential surfaces in the Exterior of Montesinos knots

answered Jul 26, 2015 at 0:18

6 votes

Accepted

Two set of axioms for Stiefel-Whitney classes

answered Jul 13, 2017 at 3:43

6 votes

Accepted

generators for the handlebody group of genus two

answered Apr 5, 2018 at 2:56

6 votes

Periods of the continued fraction expansions of Galois-conjugate quadratic-irrationals

answered May 25, 2018 at 0:01

6 votes

Could there be any homotopy group without "Lebesgue Number Lemma"?

answered Sep 30 at 13:54

5 votes

Integral solutions of quadratic equation $5 X² − 14 X⁢Y + 5 ⁢Y² = n$

answered Oct 20, 2022 at 17:41

5 votes

Do $\mathbb{HP}^2\#\overline{\mathbb{HP}^2}$ and $\mathbb{OP}^2\#\overline{\mathbb{OP}^2}$ arise as sphere bundles over spheres?

answered May 31, 2018 at 21:56

5 votes

Accepted

Homotopy classes of homeomorphisms of a multiple pointed space

answered Oct 26, 2015 at 1:30

5 votes

Five lemma in HoTop* and arbitrary pointed model categories

answered Jan 20, 2010 at 16:11

4 votes

Accepted

Realizing complexes with bases as cellular complexes

answered Dec 29, 2009 at 17:24

4 votes

Accepted

Action of Mapping Class Group on Arc complex

answered Dec 26, 2013 at 20:53

4 votes

Accepted

Discriminants of indefinite integral binary quadratic forms admitting 3 or 6 torsion.

answered Jun 12, 2013 at 3:50

4 votes

Accepted

Relationship between quotient CW-complexes after attaching cells

answered Apr 12 at 0:52

3 votes

A cubic equation, and integers of the form $a^2+192b^2$

answered Feb 15 at 17:47

3 votes

Regular polyhedral spaces

answered Aug 28, 2023 at 21:40

3 votes

Mapping Class Group action on triangulated $S^2\times S^1$?

answered Aug 9, 2016 at 21:19

3 votes

Representation of integers by principal binary quadratic forms

answered Jan 27, 2020 at 17:39

3 votes

Good reference for homology of $K(\mathbb{Z}, 2n)$?

answered Jun 7, 2010 at 20:48

2 votes

Accepted

Maps of balls with fixed value along boundary

answered Feb 23, 2015 at 14:00

2 votes

How can i change 8_19 to (3,4)-torus knot K(3,4)?

answered Mar 31, 2015 at 13:47

2 votes

Accepted

Dehn-Nielsen-Baer Theorem for surfaces with boundary and punctures

answered Aug 15, 2018 at 18:34

1 vote

Multiplicative structure in the cohomological Leray-Serre spectral sequence - please elucidate a proof

answered May 11, 2015 at 1:05

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114 Answers

Inverse cohomological isomorphisms

A homology of p-covering space

Essential surfaces in the Exterior of Montesinos knots

Two set of axioms for Stiefel-Whitney classes

generators for the handlebody group of genus two

Periods of the continued fraction expansions of Galois-conjugate quadratic-irrationals

Could there be any homotopy group without "Lebesgue Number Lemma"?

Integral solutions of quadratic equation $5 X² − 14 X⁢Y + 5 ⁢Y² = n$

Do $\mathbb{HP}^2\#\overline{\mathbb{HP}^2}$ and $\mathbb{OP}^2\#\overline{\mathbb{OP}^2}$ arise as sphere bundles over spheres?

Homotopy classes of homeomorphisms of a multiple pointed space

Five lemma in HoTop* and arbitrary pointed model categories

Realizing complexes with bases as cellular complexes

Action of Mapping Class Group on Arc complex

Discriminants of indefinite integral binary quadratic forms admitting 3 or 6 torsion.

Relationship between quotient CW-complexes after attaching cells

A cubic equation, and integers of the form $a^2+192b^2$

Regular polyhedral spaces

Mapping Class Group action on triangulated $S^2\times S^1$?

Representation of integers by principal binary quadratic forms

Good reference for homology of $K(\mathbb{Z}, 2n)$?

Maps of balls with fixed value along boundary

How can i change 8_19 to (3,4)-torus knot K(3,4)?

Dehn-Nielsen-Baer Theorem for surfaces with boundary and punctures

Multiplicative structure in the cohomological Leray-Serre spectral sequence - please elucidate a proof