Not a question: I spent most of the day exploring questions that popped up in my head recently, some basic and some a little bit more subtle. One of them was the extension of the "2nd Derivative Test" for functions of 2 variables to the n-dimensional case. Anybody who's bored is welcome to find mistakes in my work or make suggestions for more elegance.

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This question would be in better company amongst those of http://math.stackexchange.com/.

Maybe, but I don't think it's quite advanced enough work for that.

You and I haven't been visiting the same site. I see a precalculus question there every day.

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