This is a classic problem solving activity that I first saw many years ago in Mathematics: A Human Endeavor. The NCTM has a nice applet to test cases one at a time. Since I like playing with Excel and … Read More
I made this video when I was thinking about ways to teach the basics of linear transformations and matrices by illustrating their connections to computer graphics. I wanted to show the actual matrix calculations that lead to the graphics, as … Read More
Puzzle books I had as a kid often asked what the intersection of three cylinders looked like. Even looking at the answer in the back, I still had trouble seeing it. Making this video helped a lot. The Sketch Up … Read More
This is my first Sketch Up video. It is surprising how many shapes the cross-section of a cube can take on, and how hard they are to visualize (for most of us). The Sketch Up file I used is in … Read More
Visual Quadratic Reciprocity
This one’s harder.
Is teaching math to kids easy? Should any reasonably intelligent person who can do “plus, times, minus, and divide” be able to start teaching elementary math tomorrow, skipping college math and all those waste-of-time education classes? Could most smart people, … Read More
Sporcle game here. Name all the primes less than 100 in 3 minutes.
Practice with this Sporcle quiz — three minutes to count from one to twenty-five in base two. Let me know what you think. This is my first Sporcle Quiz ever.
Last night I went to see the play Truth Values: One Girl’s Romp Through MIT’s Male Math Maze, written and performed by Gioia De Cari. Gioia and I were friends at MIT – we both started the Math PhD program … Read More