Abstraction principle
Summary
A formula of the form (∀α)(∀β)(Abst(α) = Abst(β) ↔ Equ(α, β)), where Abst is an abstraction operator mapping the type of entities ranged over by α and β to objects, and “Equ” is an equivalence relation on the type of entities ranged over by α and β. For instance, Hume's principle, and Basic Law V.
Further reading
- Wikipedia, page 76765067, revision 1368301704, Glossary of logic, section A. adopted
About this page
| Tag | XSZGB47B6Y |
|---|---|
| URI | m2://XSZGB47B6Y |
| Kind | concept |
| Writing | W1 stated |
| Changed | 4 November 2026 |
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- 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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