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In 1913, Ramanujan asked if the Diophantine equation of second order 2^n-7=x^2, sometimes called the Ramanujan-Nagell equation, has any solutions other than n=3, 4, 5, 7, and ...

The triangle line that passes through the inner and outer Soddy centers S and S^'. The Soddy line is central line L_(657) and has trilinear equation ...

The order of the polynomial defining an algebraic curve.

A 19-sided polygon, sometimes also called the enneakaidecagon.

If a distribution has a single mode at mu_0, then P(|x-mu_0|>=lambdatau)<=4/(9lambda^2), where tau^2=sigma^2+(mu-mu_0)^2.

A function f:A->B such that B is a set of numbers.

A cellular space is a T2-space that has the structure of a so-called CW-complex.

A knot diagram which does not specify whether crossings are under- or overcrossings.

An unknot which can only be unknotted by first increasing the number of crossings.

A Hamiltonian cycle, also called a Hamiltonian circuit, Hamilton cycle, or Hamilton circuit, is a graph cycle (i.e., closed loop) through a graph that visits each node ...