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One of the disjoint subsets making up a set partition. A block containing n elements is called an n-block. The partitioning of sets into blocks can be denoted using a ...

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 ...

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

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

A simple pole of an analytic function f is a pole of order one. That is, (z-z_0)f(z) is an analytic function at the pole z=z_0. Alternatively, its principal part is c/(z-z_0) ...

A set having exactly one element a. A singleton set is denoted by {a} and is the simplest example of a nonempty set.

The small world problem asks for the probability that two people picked at random have at least one acquaintance in common.

A smooth curve is a curve which is a smooth function, where the word "curve" is interpreted in the analytic geometry context. In particular, a smooth curve is a continuous ...

Socrates is reported to have stated: "One thing I know is that I know nothing."

A nickname for the one-sheeted hyperboloid due to Samuel (1988, p. 95).