FRP was introduced as Functional Reactive Animation (Fran) by Elliott and Hudak in 1997 [EH97] with a focus on the creation of animations. In Fran, continuous, time-varying values of type a are Behaviors and represented by the polymorphic type Behavior a. Events constitute values that are defined at discrete points in time, their polymorphic type corresponds to Event a.
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GÖTZ, Julian, 2020. Distributed Systems Extensions for the Dunai FRP Library. page 