Complexity classes | Undecidable problems

RE (complexity)

In computability theory and computational complexity theory, RE (recursively enumerable) is the class of decision problems for which a 'yes' answer can be verified by a Turing machine in a finite amount of time. Informally, it means that if the answer to a problem instance is 'yes', then there is some procedure that takes finite time to determine this, and this procedure never falsely reports 'yes' when the true answer is 'no'. However, when the true answer is 'no', the procedure is not required to halt; it may go into an "infinite loop" for some 'no' cases. Such a procedure is sometimes called a semi-algorithm, to distinguish it from an algorithm, defined as a complete solution to a decision problem. Similarly, co-RE is the set of all languages that are complements of a language in RE. In a sense, co-RE contains languages of which membership can be disproved in a finite amount of time, but proving membership might take forever. (Wikipedia).

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From playlist All Things Recursive - with Math and CS Perspective

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From playlist Challenge Problems

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From playlist Solve Multi-Step Equations......Help!

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From playlist Differential Equations

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From playlist Research Spotlights

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From playlist Integrals

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From playlist Advanced Calculus / Multivariable Calculus

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From playlist Circulatory system diseases | NCLEX-RN | Khan Academy

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From playlist How to Solve Multi Step Equations with Variables on Both Sides

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Word problem for groups | Decision problem | List of undecidable problems | R (complexity) | Group (mathematics) | Recursive language | Formal grammar | Computable function | Word problem (mathematics) | Semigroup | Decidability (logic) | Many-one reduction | Risch algorithm | Computability theory | Polymorphic recursion | Turing machine | Halting problem | Diophantine set | Communications of the ACM | Post correspondence problem | Quantum entanglement | Diophantine equation | Wang tile | Connes embedding problem | Algorithm | Computational complexity theory | Satisfiability | Unrestricted grammar | Validity (logic) | First-order logic | Knuthโ€“Bendix completion algorithm | Complexity class | Infinite loop