Definable real number
Summary
Informally, a definable real number is a real number that can be uniquely specified by its description. The description may be expressed as a construction or as a formula of a formal language. For example, the positive square root of 2, , can be defined as the unique positive solution to the equation , and it can be constructed with a compass and straightedge.
Further reading
- Wikipedia, page 8361, revision 1345380121, Definable real number. adopted
About this page
| Tag | G9JMCHQD2M |
|---|---|
| URI | m2://G9JMCHQD2M |
| Aliases | arithmetical-number, arithmetical-numbers, arithmetically-definable-number, definable-number, definable-numbers, definable-real-numbers, undefinable-number, undefinable-numbers |
| Kind | concept |
| Writing | W1 stated |
| Same as | |
| Changed | 4 November 2026 |
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What this page needs for W2
- edge defines in: at least one definition (0 of 1)
- edge instance_of in: at least two examples (0 of 2)
- edge not_instance_of in: at least one non-example (0 of 1)
- edge specializes both: the more general notions and the special cases (0 of 1)
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