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The definition of a set by enumerating its members. An extensional definition can always be reduced to an intentional one. An extension field is sometimes also called simply ...

A set function is a function whose domain is a collection of sets. In many instances in real analysis, a set function is a function which associates an affinely extended real ...

For a set S, the span is defined by maxS-minS, where max is the maximum and min is the minimum.

If a triangle is inscribed in a conic section, any line conjugate to one side meets the other two sides in conjugate points.

The surface corresponding to the region of obscuration when a solid is illuminated from a point light source (located at the radiant point). A disk is the shadow of a sphere ...

Although a numerically computed chaotic trajectory diverges exponentially from the true trajectory with the same initial coordinates, there exists an errorless trajectory ...

A conjecture that, as proved by Parshin (1968), implies the Mordell conjecture.

A transformation in which all points along a given line L remain fixed while other points are shifted parallel to L by a distance proportional to their perpendicular distance ...

The distance a point moves due to shear divided by the perpendicular distance of a point from the invariant line.

A sorting method proposed by Shell (1959) in which records being sorted can take long jumps instead of being restricted to short steps.