# Article

Full entry | PDF   (0.1 MB)
Keywords:
sigma-porous; sigma-bilaterally-porous; right porous
Summary:
A closed subset of the real line which is right porous but is not $\sigma$-left-porous is constructed.
References:
[F] Foran J.: Continuous functions need not have $\sigma$-porous graphs. Real Anal. Exchange 11 (1985-86), 194-203. MR 0828490 | Zbl 0607.26005
[Za 1] Zajíček L.: On $\sigma$-porous sets and Borel sets. Topology Appl. 33 (1989), 99-103. MR 1020986
[Za 2] Zajíček L.: Sets of $\sigma$-porosity and sets of $\sigma$-porosity $(q)$. Časopis Pěst. Mat. 101 (1976), 350-359. MR 0457731 | Zbl 0341.30026
[Za 3] Zajíček L.: Porosity and $\sigma$-porosity. Real Anal. Exchange 13 (1987-88), 314-350. MR 0943561
[E-H-S] Evans M.J., Humke P.D., Saxe K.: A symmetric porosity conjecture of L. Zajíček. Real Anal. Exchange 17 (1991-92), 258-271. MR 1147367

Partner of