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Contains the following math formula (red border means the formula is incomplete)

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A $σ$ -porous set need not be $σ$ -bilaterally porous

R. J. Nájares; Luděk Zajíček — 1994

Commentationes Mathematicae Universitatis Carolinae

A closed subset of the real line which is right porous but is not $σ$ -left-porous is constructed.

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