Word:

name capture

(reduction)name capture - In beta reduction, when a term containing a free occurrence of a variable v is substituted into another term where v is bound the free v becomes spuriously bound or "captured". E.g.

(\ x . \ y . x y) y --> \ y . y y (WRONG)

This problem arises because two distinct variables have the same name. The most common solution is to rename the bound variable using alpha conversion:

(\ x . \ y' . x y') y --> \ y' . y y'

Another solution is to use de Bruijn notation.

Note that the argument expression, y, contained a free variable. The whole expression above must therefore be notionally contained within the body of some lambda abstraction which binds y. If we never reduce inside the body of a lambda abstraction (as in reduction to weak head normal form) then name capture cannot occur.
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nalidixic acid
NALIS
Nall
Nalline
nalogous pole
nalorphine
naloxone
naltrexone
Nam
Namable
Namation
Namaycush
Namby-pamby
Name
name and address
name calling
-- name capture --
name day
name dropper
name part
Name plate
name resolution
name service switching
name tag
name-dropping
named
named pipe
namedrop
namedropper
nameko
Nameless
Namelessly
namelessness
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