. . . . "We show that in a topologically complete metric space with no isolated points there exists a closed upper porous set (in a strong sense) which is not $\\sigma$-lower porous (in a weak sense)." . "P(GA201/06/0198)" . . "[D00C3FE98C82]" . "10"^^ . "Koc, Martin" . . "RIV/00216208:11320/10:10057767" . "11320" . . "1"^^ . . . . . "We show that in a topologically complete metric space with no isolated points there exists a closed upper porous set (in a strong sense) which is not $\\sigma$-lower porous (in a weak sense)."@en . . "Porous; Not-sigma-Lower; are; which; Sets; Porous; Upper"@en . "Upper Porous Sets which are Not-sigma-Lower Porous"@en . "Upper Porous Sets which are Not-sigma-Lower Porous" . "1"^^ . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "294473" . . . "Real Analysis Exchange" . "1" . . "0147-1937" . . . "Upper Porous Sets which are Not-sigma-Lower Porous" . "35" . "Upper Porous Sets which are Not-sigma-Lower Porous"@en . . "RIV/00216208:11320/10:10057767!RIV11-GA0-11320___" .