Home Page - Joel W. Robbin

Mathematics Department, University of Wisconsin, Madison, Wisconsin 53706 My Phone: 608. 263-4698. Department Phone: 608. 263-3054. Department Fax: 608. 263-8891. Email: robbin@math.wisc.edu Office hours: 9:30-12:30 Thursday or by appointment.

I am currently teaching Math 521

Timetable and Recent Enrollment Figures
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Go here for information on the department's policies concerning the possible flu pandemic.

I am the course supervisor for Math 112 (College Algebra.) Here is a Plan for a Technology Enhanced redesign of that course.

• Some interesting elementary problems.
• Here is the final exam for math 112 from last fall.

Old Courses:

• Math 320 (Linear Algebra and Differential Equations Spring 2009.)
• Math 131 Home Page (Fall 2007).
• Math 141 Home page (Fall 2006)
• Calculus 221 Home Page Fall 2006)
• 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)

Some talks and notes.

• Some Notes on Chemical Reaction Networks (shamelessly cribbed from Jeremy Gunwardena).
• Ultrafilters and Arrow's Theorem on the Impossibility of A Fair Election.
• 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.
• 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.)

Paradoxes.

• 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!

Careers in mathematics.

• Why major in Mathematics? (University of Georgia)
• Mathematics Job Opportunities? (University of Georgia)
• MAA Online review of 101 Careers in Mathematics
• MAA Online review of She Does Math
• MAA Online review of Great Jobs For Math Majors
• Career Profiles (Part of the AMS-MAA-SIAM Mathematical Sciences Career Information Project)

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