## 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

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