You know you are doing a good job as a math professor when your students keep track of all the funny things that you say in class. Tom Garrity is doing a good job. My favorites:

I read “Hessian,” I think, “Why are 2 x 2 matrices invading our country?”

Easy to compute, but dripping with meaning.

It’s like if you’re a doctor and you go, “Oh right, it’s two kidneys and one liver.”

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