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[lambda-calculus] The application of a lambdaabstraction to an argument expression. A copy of the body of
the lambda abstraction is made and occurrences of the boundvariable being replaced by the argument. E.g.
( x . x+1) 4 --@# 4+1
Beta reduction is the only kind of reduction in the purelambda-calculus. The opposite of beta reduction is betaabstraction. These are the two kinds of beta conversion.
See also name capture.