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Parchment

Parchment is a material for the pages of a book or codex, made from fine calf skin. Parchment is named after the city Pergamon where it was first invented. One sort of parchment is vellum[?].

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Quadratic formula

... (but see below for generalizations) with a being non-zero. These solutions are also called the roots of the equation. The formula reads <math> x=\frac{-b \pm ...