POINTS OF CONTINUITY, QUASICONTINUITY, CLIQUISHNESS, AND UPPER AND LOWER QUASICONTINUITY

摘要

The quadruplet (C(f),Q(f), E(f), A(f)) is characterized, where C(f), Q(f), E(f) and A(f) are the sets of all continuity, quasicontinuity, upper and lower quasicontinuity and cliquishness points of a real function / of real variable, respectively.