Some articles on classes, proper classes, proper:
... to the treatments of theories of sets and classes ... Indeed, urelements are in some sense dual to proper classes urelements cannot have members whereas proper classes cannot be members ... Put differently, urelements are minimal objects while proper classes are maximal objects by the membership relation (which, of course, is not an order relation ...
... The Russell class is a proper class Proof ... Suppose (towards a contradiction) that is a proper class ... Suppose that is a proper class ...
Famous quotes containing the words classes and/or proper:
“Genocide begins, however improbably, in the conviction that classes of biological distinction indisputably sanction social and political discrimination.”
—Andrea Dworkin (b. 1946)
“I should like to know what is the proper function of women, if it is not to make reasons for husbands to stay at home, and still stronger reasons for bachelors to go out.”
—George Eliot [Mary Ann (or Marian)