Lee Mosher's user avatar
Lee Mosher's user avatar
Lee Mosher's user avatar
Lee Mosher
  • Member for 12 years, 2 months
  • Last seen this week
  • Rutgers University, Newark
53 votes

When has discrete understanding preceded continuous?

45 votes
Accepted

Conjugacy classes of $\mathrm{SL}_2(\mathbb{Z})$

38 votes
Accepted

Connected sum of topological manifolds

37 votes

Is rigour just a ritual that most mathematicians wish to get rid of if they could?

34 votes

Why are free objects "free"?

28 votes

Kirby's torus trick

27 votes

Occurrences of (co)homology in other disciplines and/or nature

23 votes

Do mathematicians rely on senses other than vision and hearing?

22 votes

Instances where an existence result precedes the constructive version

21 votes

Group theory with grep?

20 votes

Actions on Sⁿ with quotient Sⁿ

20 votes
Accepted

Periodic automorphisms of free groups

19 votes

Fundamental groups of noncompact surfaces

19 votes

How can a mathematician handle the pressure to discover something new?

18 votes

Subgroups of $SL_2(\mathbb R)$ which contain $SL_2(\mathbb Z)$ as a finite index subgroup

17 votes
Accepted

$\operatorname{Out}(F_n)$ is not linear for $n > 3$

17 votes

Are there some other notions of "curvature" which measure how space curves?

15 votes

Was the early calculus inconsistent?

14 votes
Accepted

Universal covering of compact surfaces

14 votes

Why is the fundamental group of a compact Riemann surface not free ?

14 votes

Is each closed convex set a manifold with corners?

13 votes
Accepted

Integer matrix that does not belong to a free group of rank 2

13 votes

When can a class in $H^1(M;\mathbb{Z})$ be represented by a fiber bundle over $S^1$

13 votes

Finite subgroups of mapping class groups

13 votes

Why are Fuchsian groups interesting?

13 votes

Continuous notions with compelling discrete analogues

13 votes

Compelling evidence that two basepoints are better than one

13 votes
Accepted

Kernel of linear representation of Baumslag-Solitar group

12 votes

Demystifying complex numbers

12 votes
Accepted

The role of the Automatic Groups in the history of Geometric Group Theory

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