byrnema comments on Mechanics without wrenches - Less Wrong
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That's an unfortunate example: to the extent which economics is quantifiable, it's all differential equations... heck, marginal utility is a differential equation!
Maybe they weren't explicitly stated as differential equations but:
so it can't be helped.
Speaking of differential equations in economics, a friend of mine has had an idea that there should be an economics textbook for mathematicians, because it annoyed him so much that they seem to dance around mathematical concepts--for example, marginal anything is clearly a derivative, although normal econ textbooks never call it that.
Not in the discrete case.
That's odd -- if anything, econ usually gets accused of being way too much about mathematical formalism. This, for example, might as well be "an economics textbook for mathematicians"; maybe your friend will find it helpful.
Do you mean a math text for economists?