theory or logical system weaker than decidability is semidecidability. A theory is semidecidable if there is a well-defined method whose result, given...

following are all equivalent properties of a set S of natural numbers: Semidecidability: The set S is computably enumerable. That is, S is the domain (co-range)...

models are provable. Although the logical consequence relation is only semidecidable, much progress has been made in automated theorem proving in first-order...

called recursively enumerable (also recognizable, partially decidable, semidecidable, Turing-acceptable or Turing-recognizable) if it is a recursively enumerable...

set of axioms and the set of inference rules are decidable sets or semidecidable sets, respectively. A formal language is a language that uses a set...

List of undecidable problems Polymorphic recursion Risch algorithm Semidecidability Complexity Zoo: Class RE Korfhage, Robert R. (1966). Logic and Algorithms...

YES is a recursive set. A decision problem is partially decidable, semidecidable, solvable, or provable if the set of inputs for which the answer is...

Boolean or Heyting algebras over open sets, which are characterized as semidecidable (equivalently, finitely observable) properties. Topology is relevant...

is called computably enumerable (synonyms: recursively enumerable, semidecidable) if there is a computable function f such that for each number n, f(n)...

indecisive, occision, pesticide, précis, precise, precision, scissors, semidecidable, succise, succision, suicide cal-, call- beautiful Greek καλός (kalós)...

complexity of decidable cases. Since full first-order logic is only semidecidable, one line of research attempts to find efficient decision procedures...

terms for computably enumerable include recursively enumerable and semidecidable). Equivalently, a set is c.e. if and only if it is the range of some...

More specifically, it is a co-RE-complete problem and therefore not semidecidable. This fact has to do with the undecidability of the validity problem...

functions are analogous to continuous functions. Semidecidable sets are analogous to open sets. Co-semidecidable sets are analogous to closed sets. There is...

partial equivalence relations, then it becomes possible to consider semidecidable notions of equivalence on computable realisers for sets. This allows...

its unprovability. In the general case, where provability is only a semidecidable property, this is not possible, and instead the procedure will diverge...

Turing machines, and Δ 2 1 {\displaystyle \Delta _{2}^{1}} sets are semidecidable.[clarification needed] Zeno machines cannot solve their own halting...

indecisive, occision, pesticide, précis, precise, precision, scissors, semidecidable, succise, succision, suicide cal-, call- beautiful Greek καλός (kalós)...

particular example, the authors defined s to be (positively) recursively semidecidable, or simply semirecursive. In predicate calculus, a Henkin witness for...

intermediate between decidable and classical truth values is the assembly of semidecidable truth values. It is carried by { 0 , 1 } {\displaystyle \{0,1\}} , and...

expressive power. The inconsistency problem of dependence logic is semidecidable, and in fact equivalent to the inconsistency problem for first-order...