(Or "contraction") The process of transforming an expression according to
certain reduction rules. The most important forms are beta reduction
(application of a lambda abstraction to one or more argument expressions) and
delta reduction (application of a mathematical function to the required number
An evaluation strategy (or reduction strategy), determines which part of an
expression (which redex) to reduce first. There are many such strategies.
See graph reduction, string reduction, normal order reduction, applicative order
reduction, parallel reduction, alpha conversion, beta conversion, delta
conversion, eta conversion.
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