@MISC{ZFMISC_1.MIZ,
  AUTHOR = {Byli\'nski, Czes{\l}aw},
  TITLE = {Some Basic Properties of Sets},
  SECTION1 = {Cartesian product of sets},
  SECTION2 = {Basic properties of sets},
  DAY = {01},
  MONTH = {February},
  YEAR = {1989},
  ADDRESS1 = {Warsaw University\\Bia{\l}ystok},
  SUMMARY = {In this article some basic theorems about singletons, pairs, power sets, 
unions of families of sets, and the cartesian product of two sets
are proved.}}

