"The physicist who states a law of nature with the aid of a mathematical formula is abstracting a real feature of a real material world, even if he has to speak of numbers, vectors, tensors, state-functions, or whatever to make the abstraction."

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Have you ever seen a demonstrable example of equality in your entire life? Can it be glimpsed in any dog show or classroom? In any ping pong game or chess match? Of course not. It is a philosophical abstraction, something nowhere to be found in nature.

— Boyd Rice