EntityQ877945· pop 23· linked from 417 articlesrecursive setSign in to saveSet where an algorithm can take a number as an input and can decide whether the number belongs to the setConnectionssemantic theory of truthEntitymathematical logicEntityimageEntityfirst-order logicEntityformal systemEntitysemantics of logicEntityrecursively enumerable setEntitystructureEntitydiagramEntityground expressionEntitylogicEntityBertrand RussellEntityInternational Standard Book NumberEntityalgorithmEntitynatural numberEntityprime numberEntityset theoryEntityfunctionEntityJohn von NeumannEntitysetEntityCategoriesComputability theoryTheory of computation