EntityQ3606768· pop 9· linked from 31 articlespropositional functionSign in to saveexpression in propositional calculusConnectionsbinary relationEntityopen formulaEntityBertrand RussellEntityiceEntityInternational Standard Book NumberEntityset theoryEntityfunctionEntitysetEntitylavaEntityvariableEntitypropositional calculusEntitypropositionEntityarityEntityUniversity of California PressEntitypredicateEntitylogical truthEntityClarence Irving LewisEntityfalseEntityprimitive notionEntitywell-formed formulaEntityCategoriesConcepts in logicFunctions and mappingsLogical expressionsMathematical relationsPredicate logic