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Lambda Abstraction




More specifically, a lambda abstraction is a lambda expression with no free variables: each of its variables is bound by some lambda. E.g.
:f (f (f x))
is a concrete lambda expression, whereas
:λf. λx. f (f (f x))
is an abstract lambda expression.

For example, λ could stand for 'for each', 'for some', or 'there is'. In this case, the expression could stand for a 'logic proposition'.