Jim Belk

Ithaca, NY, USA

https://e.math.cornell.edu/people/belk

I am a visiting assistant professor at Cornell University. My research areas include group theory, topology, and dynamical systems.

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Are the primes normally distributed? Or is this the Riemann hypothesis?

nt.number-theory prime-numbers probability-distributions riemann-hypothesis asked Apr 13, 2014 at 16:42

mathoverflow.net

44 votes

How is calculus helpful for biology majors?

undergraduate-education course-design calculus biology asked Apr 29, 2014 at 18:51

matheducators.stackexchange.com

43 votes

Does every bijection of $\mathbb{Z}^2$ extend to a homeomorphism of $\mathbb{R}^2$?

general-topology manifolds geometric-topology asked Jun 10, 2015 at 21:47

math.stackexchange.com

41 votes

Is the complement of countably many disjoint closed disks path connected?

general-topology connectedness geometric-topology asked Jun 11, 2015 at 16:42

math.stackexchange.com

36 votes

Is there an analog of Sperner's lemma for the Hopf invariant?

co.combinatorics at.algebraic-topology homotopy-theory asked Jan 24, 2014 at 21:59

mathoverflow.net

26 votes

What are some good examples of rate equations for a math class?

kinetics asked Mar 16, 2014 at 19:29

chemistry.stackexchange.com

24 votes

Why aren't logarithms introduced earlier?

secondary-education curriculum asked Apr 20, 2014 at 22:40

matheducators.stackexchange.com

24 votes

Is an isometric embedding of a disk determined by the boundary?

differential-geometry surfaces asked Jan 11, 2014 at 5:30

math.stackexchange.com

23 votes

What are some good rules for handling student questions during exams?

classroom-management exams asked Mar 21, 2014 at 21:45

matheducators.stackexchange.com

23 votes

Codimension of Measurable Sets

measure-theory set-theory real-analysis asked Feb 13, 2011 at 8:20

mathoverflow.net

Top Answers

227

Perfectly centered break of a perfectly aligned pool ball rack

mathoverflow.net

123

Evaluate $\int_0^1 \frac{\log \left( 1+x^{2+\sqrt{3}}\right)}{1+x}\mathrm dx$

math.stackexchange.com

Why is having multiple college majors seen as a bad thing when applying to graduate school?

academia.stackexchange.com

Perfectly centered break of a perfectly aligned pool ball rack

math.stackexchange.com

What knot is this?

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Path connectedness and locally path connected

math.stackexchange.com

What is a good handwriting font for mathematics?

matheducators.stackexchange.com

How to calculate the pullback of a $k$-form explicitly

math.stackexchange.com

Why has 5e moved away from "per encounter" language?

rpg.stackexchange.com

Quaternion distance

math.stackexchange.com

What's the difference between early transcendentals and late transcendentals?

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Are there any "related rates" calculus problems that don't feel contrived?

mathoverflow.net

Product of spheres embeds in Euclidean space of 1 dimension higher

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How to find a random axis or unit vector in 3D?

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Are continuous self-bijections of connected spaces homeomorphisms?

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Addition is to Integration as Multiplication is to ______

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Function with range equal to whole reals on every open set

mathoverflow.net

Group presentation for semidirect products

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How to prove that the Fibonacci sequence is periodic mod 5 without using induction?

math.stackexchange.com

An explicit example of a finitely presented group containing a subgroup isomorphic to $(\mathbb Q,+)$.

mathoverflow.net

Isomorphism between complex numbers minus zero and unit circle

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Differential topology versus differential geometry

math.stackexchange.com

Optimization problems that today's students might actually encounter?

matheducators.stackexchange.com

The best way to introduce trigonometric functions in a rigorous analysis course

matheducators.stackexchange.com

Divergence as transpose of gradient?

math.stackexchange.com

Not especially famous, long-open problems which anyone can understand

mathoverflow.net

Haar measure on $\operatorname{SO}(n)$

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When $f(x+1)-f(x)=f'(x)$, what are the solutions for $f(x)$?

math.stackexchange.com

Why is $SO(3)\times SO(3)$ isomorphic to $SO(4)$?

math.stackexchange.com

Uncountable set of irrational numbers closed under addition and multiplication?

math.stackexchange.com