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Talk:Mathematical class

There are many meanings of the word "class" in mathematics, but only one (to my knowledge) in set theory. Someday, we'll want to write about the others. — Toby 05:48 Nov 29, 2002 (UTC)

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Quadratic formula

... solutions x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.) If the discriminant is negative, then there are ...