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Cyan comments on What is control theory, and why do you need to know about it? - Less Wrong
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Isn't a control system using feedback basically analogous to a look-up table? Feedbacks by themselves aren't optimizers, they're happenstance. Feedbacks that usefully seek a goal constitute the output of an optimization process that ran beforehand.
Only in the sense that, say, the Lotka-Volterra equations are basically analogous to a look-up table. You'd be missing out if you thought that's all it was.
Those ones are happenstance. They just feed back, they're not going anywhere.
The analogy I mean is that like a LUT, the answer to any particular question is embodied in the pre-existing structure. And this correlation of response to result is optimized, it's not luck.