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de bruijn notation
(foldoc) | De Bruijn notation
A variation of lambda notation for specifying
functions using numbers instead of names to refer to {formal
parameters}. A reference to a formal parameter is a number
which gives the number of lambdas (written as \ here) between
the reference and the lambda which binds the parameter.
E.g. the function \ f . \ x . f x would be written \ . \ . 1
0. The 0 refers to the innermost lambda, the 1 to the next
etc. The chief advantage of this notation is that it avoids
the possibility of name capture and removes the need for {alpha
conversion}.
[N.G. De Bruijn, "Lambda Calculus Notation with Nameless
Dummies: A Tool for Automatic Formula Manipulation, with
Application to the Church-Rosser Theorem", Indag Math. 34, pp
381-392].
(2003-06-15)
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