$R^i$-sets and contractibility

  • Bong Sin Baik (Department of Mathematics Education Woo-Suk University Chonbuk 565-701, Korea) ;
  • Kul Hur (Department of Mathematics Won-Kwang University Iksan 570-749, Korea) ;
  • Choon Jai Rhee (Department of Mathematics Wayne State University Detroit, Michigan 48202, U.S.A.) ;
  • Published : 1997.05.01