# Level Surfaces and Quadratic Surfaces

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For a function of three variables, , , and , the level surface of level is defined as the set of points in that are solutions of . A quadratic surface or quadric* *is a surface that is given by a second-order polynomial equation in the three variables , , and .

Contributed by: Ana Moura Santos and João Pedro Pargana (Instituto Superior Técnico) (March 2011)

Open content licensed under CC BY-NC-SA

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