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The mixtilinear circle is the circumcircle of the mixtilinear triangle, i.e., the triangle formed by the centers of the mixtilinear incircles. Neither its center not circle ...

A mental device used to aid memorization. Common mnemonics for mathematical constants such as e and pi consist of sentences in which the number of letters in each word give ...

A lattice which satisfies the identity (x ^ y) v (x ^ z)=x ^ (y v (x ^ z)) is said to be modular.

Spherical triangles into which a sphere is divided by the planes of symmetry of a uniform polyhedron.

The partial differential equation (Cole and Cook 1986, p. 34; Zwillinger 1997, p. 134).

A mathematical object which consists of a set of a single element, making it a 1-tuple. The yin-yang is also known as the monad.

In above figure, which constitutes a modified version of the painting Tirets by Francois Morellet, small circles seem to appear and disappear as the eye is moved over them.

A necessary and sufficient condition that [alpha^'] should be comparable with [alpha] for all positive values of the a is that one of (alpha^') and (alpha) should be ...

A theorem in game theory which guarantees the existence of a set of mixed strategies for finite, noncooperative games of two or more players in which no player can improve ...

A curve also known as swan-like curve or streamline. It is given by the polar equation r=atheta+b, where a>0.