- Contact

Department of Mathematics

David Rittenhouse Lab.

209 South 33rd Street

Philadelphia, PA 19104-6395.

(215) 898-7835

8-7835 on campus

pcahn (at) math (dot) upenn (dot) edu

Office: DRL 4C7 - Office Hours:

Calculus: Thursday 1-2, Friday 3-4

Topology: Monday 4:20-5:20,

Tuesday 1-2

And by appointment.

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I am a Hans Rademacher Instructor of Mathematics
at the University of
Pennsylvania, working in low-dimensional and geometric
topology.
I received my PhD from Dartmouth
College in 2012, where my advisor was Vladimir Chernov.
I received my BA in Mathematics, and a minor in music, from Smith
College in 2006. I was a visiting scientist at the Max Planck Institute for
Mathematics from January-August 2014.

This spring I am teaching Math 560/730, a topics course on knot
theory and low-dimensional topology.

I am interested in geometric
and low-dimensional topology.

The Number of Framings of a
Knot in a 3-Manifold, (with V. Chernov and R. Sadykov.) To appear in J. Knot Theory Ramifications.

Vassiliev Invariants of
Virtual Legendrian Knots, (with A.
Levi.) To appear in Pacific J. Math.

A
Generalization of the Turaev Cobracket and the Minimal
Self-Intersection Number of a Curve on a Surface. New York J. Math. 19 (2013),
253–283.

Intersections
of Loops and the Andersen-Mattes-Reshetikhin Algebra,
(with
V. Chernov.) J. Lond. Math. Soc.
(2) 87 (2013), no. 3, 785–801.

The Classification of V-Transverse Knots and Loose Legendrians, (with V. Chernov.) Submitted.

A Generalization of Turaev's Virtual String Cobracket. Submitted.

Intersections of arcs and curves on surfaces.

Infinitesimal fibrations of spheres by great circles (with H. Gluck and H. Nuchi.)

On the classification of non-nullhomologous Legendrians (with B. Tosun.)

Math 500: Topology (Fall 2013,
Fall 2014)

Math 240: Calculus, Part III (Fall 2013)

Math 420: Ordinary Differential
Equations (Fall 2012)

Math 104: Calculus, Part I (Fall 2012,
Spring 2013, Fall 2014)

Math 32: The Shape of Space, Winter 2012: A course in intuitive geometry and topology for mathematics majors.

Math
31: Topics in Algebra,
Fall 2010: A course in
introductory group and ring theory for mathematics majors.

Math 1: Calculus with Algebra, Fall 2009: An introductory calculus course beginning with a review of precalculus.

I play the double bass. I am currently a member of the Penn Symphony Orchestra.