Level Set


In mathematics, a level set of a real-valued function f of n variables is a set of the form

that is, a set where the function takes on a given constant value c.

When the number of variables is two, a level set is generically a curve, called a level curve, contour line, or isoline. When n = 3, a level set is called a level surface (see also isosurface), and for higher values of n the level set is a level hypersurface.

A set of the form

is called a sublevel set of f (or, alternatively, a lower level set or trench of f).

is called a superlevel set of f.

A level set is a special case of a fiber.

Read more about Level Set:  Properties

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    All’s oblique;
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    The cunningest dissimulation is when a man pretends to be caught in the traps others set for him; and a man is never so easily over-reached as when he is contriving to over-reach others.
    François, Duc De La Rochefoucauld (1613–1680)