I appreciate the kind words! And yeah, that could have even been MS Paint: it's been a long time, and I was still using Windows a lot back then. (I made the fir

I appreciate the kind words! And yeah, that could have even been MS Paint: it's been a long time, and I was still using Windows a lot back then. (I made the first version of this page for my wife when the topic came up in one of her graduate math courses: I'd had a much better exposure to Lagrange multipliers in my Calc 3 class than she'd had, and since she was studying in another state at the time I wrote it up in HTML instead of on paper.) I've occasionally thought about going back and redrawing those first few images in some better form, but hey: they still get the idea across perfectly well. I have every intention of keeping it online indefinitely, as long as my friends doing the hosting don't get sick of me mooching off their web space.