Recurrence and recurrent may refer to: *

Disease recurrence In internal medicine, relapse or recidivism is a recurrence of a past (typically medical) condition. For example, multiple sclerosis and malaria often exhibit peaks of activity and sometimes very long periods of dormancy, followed by relapse or re ...

, also called "relapse" * Eternal recurrence, the concept that the universe is perpetually recurring *

Historic recurrence Historic recurrence is the repetition of similar events in history. The concept of historic recurrence has variously been applied to overall human history (''e.g.'', to the rises and falls of empires), to repetitive patterns in the history of ...

, the repetition of similar events in history *

Poincaré recurrence theorem In mathematics and physics, the Poincaré recurrence theorem states that certain dynamical systems will, after a sufficiently long but finite time, return to a state arbitrarily close to (for continuous state systems), or exactly the same as (fo ...

, Henri Poincaré's theorem on dynamical systems * Radial recurrent artery, arising from the radial artery immediately below the elbow *

Recursive definition In mathematics and computer science, a recursive definition, or inductive definition, is used to define the elements in a set in terms of other elements in the set ( Aczel 1977:740ff). Some examples of recursively definable objects include fact ...

Recurrent neural network Recurrent neural networks (RNNs) are a class of artificial neural networks designed for processing sequential data, such as text, speech, and time series, where the order of elements is important. Unlike feedforward neural networks, which proces ...

, a special artificial neural network * Recurrence period density entropy, an information-theoretic method for summarising the recurrence properties of dynamical systems *

Recurrence plot In descriptive statistics and chaos theory, a recurrence plot (RP) is a plot showing, for each moment j in time, the times at which the state of a dynamical system returns to the previous state at i, i.e., when the phase space trajectory visits rou ...

, a statistical plot that shows a pattern that re-occurs *

Recurrence relation In mathematics, a recurrence relation is an equation according to which the nth term of a sequence of numbers is equal to some combination of the previous terms. Often, only k previous terms of the sequence appear in the equation, for a parameter ...

, an equation which defines a sequence recursively *

Recurrent rotation In broadcasting, rotation is the repeated airing of a limited playlist of songs on a radio station or satellite radio channel, or music videos on a TV network. They are usually in a different order each time. However, they are not completely s ...

, a term used in contemporary hit radio for frequently aired songs *''Recurrence'', The Railway Children (band) album

See also