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A fractal produced by iteration of the equation z_(n+1)=z_n^2 (mod m) which results in a Moiré-like pattern.

Computer algebra is a diffuse branch of mathematics done with computers that encompasses both computational algebra and analysis.

The covering of a plane curve with disks of radius epsilon whose centers lie on the curve.

The product of any number of perspectivities.

A very useful active feedback method for controlling things like temperature control systems, servo motors, and flow control valves.

A space-filling function.

A translation without rotation or distortion.

Apéry's constant is defined by zeta(3)=1.2020569..., (1) (OEIS A002117) where zeta(z) is the Riemann zeta function. Apéry (1979) proved that zeta(3) is irrational, although ...

A problem posed by L. Collatz in 1937, also called the 3x+1 mapping, 3n+1 problem, Hasse's algorithm, Kakutani's problem, Syracuse algorithm, Syracuse problem, Thwaites ...

The angles mpi/n (with m,n integers) for which the trigonometric functions may be expressed in terms of finite root extraction of real numbers are limited to values of m ...