Office: 747 Evans
E-mail: kmill at math.berkeley.edu
- Math 55, Spring 2017
- Math 54, Fall 2016
- Math 54, Summer 2016
- Math 54, Spring 2016
- Math 1B, Fall 2015
- Math 1A, Spring 2015
- Math 1A, Fall 2014
- “Diagrams on surfaces and an invariant of virtual spatial graphs” for the 3-manifold seminar. April 17, 2018. (About a paper joint with Calvin McPhail-Snyder.)
- Quandles for the topology topics course. November 2, 2017.
- Spatial graph invariants for the 3-manifold seminar. September 19 & 26, 2017.
- The Alexander Ideal for “Knot Another Seminar”. April 21, 2017.
Math tools has programs for some possibly useful computations.
Notes has some notes.
Toys or demonstrations
- Hopf. Fly through a 24-cell and the Hopf flow in . WASD to move, click and drag to rotate perspective.
- zgraph is a complex function grapher that uses domain coloring. Documentation.
- Complex polynomials. Type in a polynomial (for instance, x(x+2i)^2+1), then drag the circle () on the left side around to see its image () on the right. One reason every polynomial has a root is that for large radii the image will wrap around zero times, but for very small radii the image will wrap tightly around — and somewhere in between the image must pass through zero. Arrow keys animate the domain coloring.
- Complex rational functions. Place zeros and poles of different orders on the plane, and see an animated domain coloring. The original idea was to let people have the rainbow go around points a certain number of times as a visualization of a first cohomology classes, which could make an interesting interactive exhibit at a museum. (More explanation.)
- Julia set viewer. See this post for an explanation.
- Cat transformation. Experiment with matrix transformations by transforming the image of a cat.
- Cat transformation: eigenvector edition. Shows how the eigenbasis is just scaled by the transformation.
- Basis toy. Experiment with bases of .
- Basis change toy. Experiment with two bases of .
- Heat equation & Wave equation. Click and drag a curve, then watch it evolve.
- Spring cart. A cart coupled by a spring to an oscillator.
- Row reducer. Computes the reduced row echelon form of a matrix mechanically, and displaying every step.
- Curves. Just a grid phasing through resolutions of the intersections, inspired by Vassiliev invariants. Tab, space, and ‘a’ do something.
- Trefoil. A rotating tubular neighborhood of a trefoil knot; nothing deep.