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The inner Vecten circle is the circumcircle of the inner Vecten triangle. It has center at Kimberling center X_(642), which is the complement of the inner Vecten point ...

The symbol int used to denote an integral intf(x)dx. The symbol was invented by Leibniz and chosen to be a stylized script "S" to stand for "summation."

Three concurrent homologous lines pass respectively through three fixed points on the similitude circle which are known as the invariable points.

The use of three prior points in a root-finding algorithm to estimate the zero crossing.

n divides a^n-a for all integers a iff n is squarefree and (p-1)|(n-1) for all prime divisors p of n. Carmichael numbers satisfy this criterion.

A lattice embedding is a one-to-one lattice homomorphism.

If P is any point on a line TT^' whose orthopole is S, then the circle power of S with respect to the pedal circle of P is a constant (Gallatly 1913, p. 51).

The length is the longest dimension of an object.

A level set in three dimensions.

Random walk trajectories which are composed of self-similar jumps. They are described by the Lévy distribution.