This glossary can’t cover all the mathematical terms introduced in this book, but it outlines the most fundamental terms. Some complicated, strict mathematical terms are left undefined, since their vernacular meaning is clear enough (for example, words like *point, shape*, and so on). A few other terms that don’t appear in the book are introduced here to help make other explanations briefer and more rigorous (such as *locus*), although many of the definitions still fall short of a strict mathematical formulation.

- absolute value
—For a real number

*n*, if*n*< 0 then its absolute value is –*n*, otherwise it is*n*. In other words, the absolute value of a number other than zero is always positive.- acceleration
—The rate ...

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