(mathematical analysis) a function whose value at any point in its domain is equal its limit at the same point

(mathematics) A function whose domain is the empty set.

(mathematics, statistics) A sigmoid function giving the probability that a measurement, under the influence of normally distributed errors with standard deviation, is within a certain distance from the mean value.

Synonym of ceiling function

(mathematics) A function that maps a real number to the smallest integer that is no smaller than it.

(mathematics) The signum function.

(mathematics) a type of function used in the analysis of inhomogeneous differential equations.

(mathematics) A function that maps a real number to the largest integer that is not greater than it.

(mathematics, cryptography) A function that is easy to compute in one direction but difficult to compute in the opposite direction (finding its inverse) without special information.

(computing theory) One of the simplest and earliest examples of a total computable function that is not primitive recursive.