Home Page - Joel W. Robbin

Mathematics Department, University of Wisconsin, Madison, Wisconsin 53706 Department Phone: (608) 263-3054. Department Fax: (608) 263-8891. Email: robbin@math.wisc.edu

Some talks and notes.

• Geometry and Groups
• Some lecture notes and solved problems based on do Carmo's texbook The differential Geometry of Curves and Surfaces.
• GIT and mu-GIT
• Partitions of Unity
• A talk on catastrophe theory.
• Fair Elections (A rewrite of the notes of an old talk on Arrow's Impossibility Theorem.)
• Parking a car and Lie brackets
• Some Notes on Chemical Reaction Networks (shamelessly cribbed from Jeremy Gunwardena).
• A talk on the dynamical zeta function.
• A talk on Heegard Splittings and Floer Homology.
• A paper on Heegard Splittings and Morse-Smale Flows.
• A seminar on Hamiltonian Toric Manifolds.
• A note on Kergin-Lagrange Interpolation.
• An exposition of the moment map.
• Some notes on Extrinsic Differential Geometry. On Dietmar Salamon's home page you can find an expanded version of these notes.
• I never published my PhD thesis: Subrecursive Hierarchies. Click on the link to download it. (It was accepted by the JSL but I never got around to making the revisions the referee suggested.)

Old Courses:

• Math 521 (Advanced Calculus Spring 2010)
• Math 320 (Linear Algebra and Differential Equations Spring 2009.)
• Math 131 Home Page (Fall 2007).
• Math 141 Home page (Fall 2006)
• Calculus 221 homepage (Fall 2011)
• Calculus 222 Home Page (Spring 2007).
• Calculus 234 Home Page (Fall 2001).
• Math 461 Home Page (Spring 2002)
• Math 521 Advanced Calculus (Fall 2008)
• Math 541 Home Page (Fall 2000).
• Math 542 Home Page (Spring 2001).
• Topology Seminar 951 (Fall 2001)

I was the course supervisor for Math 112 (College Algebra.) Here is a modified version of the Stitz Zeager textbook which we used in that course and the zip file of the tex source. Here is a Plan for a Technology Enhanced redesign of that course.

• Here are some interesting elementary problems appropriate for either math 112 or math 141.
• Here is the final exam for math 112 from last fall.

• A proof that every triangle is isosceles.
• Another proof that every triangle is isosceles.
• A proof that every angle is a right angle.
• You can cut up a triangle and rearrange the pieces to make one of larger area!

Miscellaneous.

• My favorite movie is Peggy Sue Gets Married.
• Try the Java Powered Graphing Calculator.
• Announcing a new Journal: The Proceedings of the Angelic Brew Pub Seminar.
• Try Vadim Ponomarenko's math skills test.
• I am the author of Matrix Algebra Using MINImal MATlab
• Try the LinearTransformation Grapher. With it you can define a linear transformation (u,v)=T(x,y), scribble in the (x,y) window (or the (u,v) window), and see the image (or the pre image) in the other window.
• Here is a proof of the Pythagorean Theorem.
• Try the Color Game!.
• Here are the words to some Funny Songs
• Examine Robin Pemantle's Higgledy Piggledy Data Base