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For questions in Mathematics Education as a scientific discipline. For more hands-on questions on teaching Mathematics, please use the tag teaching. There is also a Stack Exchange community http://matheducators.stackexchange.com/

12 votes
2 answers
2k views

Reference for a nice proof of "undetermined coefficients"

I'm teaching an honors differential equations class and have been using linear algebra heavily. I thought it would be interesting to include a proof of the method of undetermined coefficients along t …
Ryan Reich's user avatar
  • 7,273
60 votes
8 answers
12k views

Why the Killing form?

I'm teaching a short summer course on algebraic groups and it's time to talk about the Killing form on the Lie algebra. The students are all undergrads of varying levels of inexperience, and I try to …
Ryan Reich's user avatar
  • 7,273