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Single Idea 10083

[filed under theme 5. Theory of Logic / K. Features of Logics / 8. Enumerability ]

Full Idea

A set is 'effectively enumerable' if an (idealised) computer could be programmed to generate a list of its members such that any member will eventually be mentioned (even if the list is empty, or without end, or contains repetitions).

Gist of Idea

A set is 'effectively enumerable' if a computer could eventually list every member

Source

Peter Smith (Intro to Gödel's Theorems [2007], 02.4)

Book Ref

Smith,Peter: 'An Introduction to Gödel's Theorems' [CUP 2007], p.15


The 10 ideas with the same theme [whether all formulae in a system can be specified]:

There are infinite sets that are not enumerable [Cantor, by Smith,P]
A logical system needs a syntactical survey of all possible expressions [Gödel]
For a reasonable language, the set of valid wff's can always be enumerated [Enderton]
A complete logic has an effective enumeration of the valid formulas [Tharp]
Effective enumeration might be proved but not specified, so it won't guarantee knowledge [Tharp]
A set is 'enumerable' is all of its elements can result from a natural number function [Smith,P]
A set is 'effectively enumerable' if a computer could eventually list every member [Smith,P]
A finite set of finitely specifiable objects is always effectively enumerable (e.g. primes) [Smith,P]
The set of ordered pairs of natural numbers <i,j> is effectively enumerable [Smith,P]
The thorems of a nice arithmetic can be enumerated, but not the truths (so they're diffferent) [Smith,P]