alpha conversion
<theory> In lambda-calculus and reduction, the renaming of a formal
parameter in a lambda abstraction. This does not change the meaning of the
abstraction. For example:
\ x . x+1 <--> \ y . y+1
If the actual argument to a lambda abstraction contains instances of the
abstraction's formal parameter then it is necessary
to rename the parameter before applying the
abstraction to avoid name capture.
(1995-05-10)
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