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A circle-preserving transformation composed of an even number of inversions.

A formula which counts the number of fixed points for a topological transformation.

A minimization of the maximum error for a fixed number of terms.

The symbol "-" which is used to denote a negative number or subtraction.

The class m, curve order n, number of ordinary double points delta, number of cusps kappa, number of inflection points (inflection points) iota, number of bitangents tau, and ...

The symbol "+" which is used to denote a positive number or to indicate addition.

A quadrature (numerical integration) algorithm which has a number of desirable properties.

The number of poles of an automorphic function in the closure of its fundamental region.

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 ...

Bertelsen's number is an erroneous name erroneously given to the erroneous value of pi(10^9)=50847478, where pi(x) is the prime counting function. This value is 56 lower than ...