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Henkin in 1990. Leon Albert Henkin (April 19, 1921, Brooklyn, New York - November 1, 2006, Oakland, California) was an American logician, whose works played a strong role in the development of logic, particularly in the theory of types.
Jensen was honored by the Association for Symbolic Logic as the first Gödel Lecturer in 1990. [1] In 2015, the European Set Theory Society awarded him and John R. Steel the Hausdorff Medal for their paper "K without the measurable".
Set theory is the branch of mathematical logic that studies sets, which can be informally described as collections of objects.Although objects of any kind can be collected into a set, set theory – as a branch of mathematics – is mostly concerned with those that are relevant to mathematics as a whole.
Montague wrote on the foundations of logic and set theory, as would befit a student of Tarski. His PhD dissertation, titled Contributions to the Axiomatic Foundations of Set Theory, [1] contained the first proof that all possible axiomatizations of the standard axiomatic set theory ZFC must contain infinitely many axioms. In other words, ZFC ...
In simple type theory objects are elements of various disjoint "types". Types are implicitly built up as follows. If τ 1,...,τ m are types then there is a type (τ 1,...,τ m) that can be thought of as the class of propositional functions of τ 1,...,τ m (which in set theory is essentially the set of subsets of τ 1 ×...×τ m). In ...
Here a theory is a set of formulas in a particular formal logic and signature, while a model is a structure that gives a concrete interpretation of the theory. Model theory is closely related to universal algebra and algebraic geometry , although the methods of model theory focus more on logical considerations than those fields.
FOL is now a core formalism of mathematical logic, and is presupposed by contemporary treatments of Peano arithmetic and nearly all treatments of axiomatic set theory. The 1928 edition included a clear statement of the Entscheidungsproblem ( decision problem ) for FOL, and also asked whether that logic was complete (i.e., whether all semantic ...
The resolution of this crisis involved the rise of a new mathematical discipline called mathematical logic that includes set theory, model theory, proof theory, computability and computational complexity theory, and more recently, parts of computer science. Subsequent discoveries in the 20th century then stabilized the foundations of ...
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