J. N\'ajares R., L. Zaj\' \i \v cek

J. N\'ajares R., L. Zaj\' \i \v cek
A $\sigma $-porous set need not be $\sigma $-bilaterally porous

Comment.Math.Univ.Carolinae 35,4 (1994) 697-703.

Abstract:A closed subset of the real line which is right porous but is not $\sigma $-left-porous is constructed.

Keywords: {sigma-porous, sigma-bilaterally-porous, right porous}
AMS Subject Classification: Primary 26A99; Secondary 28A5