EntityQ2894292· pop 6· linked from 8 articlesDiagonal intersectionSign in to saveConnectionssemantic theory of truthEntitymathematical logicEntityfirst-order logicEntityformal systemEntityrecursive setEntitysemantics of logicEntitystructureEntityground expressionEntitydiagramEntitymathematicsEntitylogicEntityBertrand RussellEntityset theoryEntityfunctionEntityJohn von NeumannEntitysetEntityaxiomEntityGeorg CantorEntityKurt GödelEntitytheoremEntityCategoriesOrdinal numbersSet theory