Formal theories

Theory of pure equality

In mathematical logic the theory of pure equality is a first-order theory. It has a signature consisting of only the equality relation symbol, and includes no non-logical axioms at all. This theory is consistent but incomplete, as a non-empty set with the usual equality relation provides an interpretation making certain sentences true. It is an example of a decidable theory and is a fragment of more expressive decidable theories, including monadic class of first-order logic (which also admits unary predicates and is, via Skolem normal form, related to set constraints in program analysis) and monadic second-order theory of a pure set (which additionally permits quantification over predicates and whose signature extends to monadic second-order logic of k successors). (Wikipedia).

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The big mathematics divide: between "exact" and "approximate" | Sociology and Pure Maths | NJW

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From playlist Sociology and Pure Mathematics

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The Scientific Method and the question of "Infinite Sets" | Sociology and Pure Maths| N J Wildberger

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From playlist Sociology and Pure Mathematics

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From playlist Workshop: "Types, Homotopy, Type theory, and Verification"

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From playlist Set Theory

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From playlist Advanced Studies in Ordinary Differential Equations

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From playlist Introduction to Homotopy Theory

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From playlist Proof Writing

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Short Talks by Postdoctoral Members Benedikt Ahrens - September 21, 2015 http://www.math.ias.edu/calendar/event/88134/1442858400/1442859300 More videos on http://video.ias.edu

From playlist Short Talks by Postdoctoral Members

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From playlist Galois theory

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From playlist Mathematics

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From playlist Galois theory

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From playlist Integrable​ ​systems​ ​in​ ​Mathematics,​ ​Condensed​ ​Matter​ ​and​ ​Statistical​ ​Physics

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Related pages

List of first-order theories | Decidability (logic) | Equational logic | Free theory | Quantifier elimination | Complete theory | Set constraint | Mathematical logic | Monadic second-order logic | Natural number | Program analysis | Set (mathematics) | Cardinality | Skolem normal form | Consistency | Ehrenfeucht–Fraïssé game | First-order logic