TITLE: What is the meaning of primes here?
QUESTION [1 upvotes]: I'm reading Aarts: "Plane and solid geometry", here: He mentions "primes" but he didn't define it in the book.



I guess he's referring to the non-quadratic terms. But I want to be sure.

REPLY [5 votes]: Primes are the apostrophe signs, i.e. $x'$ is pronounced "x prime."
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