EntityQ818930· pop 43computability theorySign in to savestudy of computable functions and Turing degreesConnectionsrecursively enumerable setEntityGödel's incompleteness theoremsEntityarithmetical hierarchyEntitysemantic theory of truthEntityAlan TuringEntityalgorithmEntitymathematical logicEntitypower setEntityanalog computerEntityfirst-order logicEntityPeano axiomsEntityformal systemEntityStephen Cole KleeneEntityThe MIT PressEntityformal methodsEntityEmil Leon PostEntityrecursive setEntityYuri MatiyasevichEntityprimitive recursive functionEntitysemantics of logicEntity