I’d like today to share a less-old essay. This one is from the 2019 A-to-Z, and it’s about one of those fundamental topics. Differential equations permeate much of mathematics. Someone might mistake them for being *all* of advanced mathematics, or at least the kind of mathematics that professionals do. The confusion is reasonable. So I talk a bit here about why they seem to be part of everything.

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## Author: Joseph Nebus

I was born 198 years to the day after Johnny Appleseed. The differences between us do not end there. He/him.
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