The Mystery of the Fifth Logical Notion
(Alice in the Wonderful Land of Logical Notions)


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This paper will be published in a special issue of Studia Humana
edited by Andrew Schumann, dedicted to Jan Woleński's 80th birthday

To the one who will find the answer to the enigma (section 7)
will be offered a one-way trip to Boole crater, headquarters of LUA!
Are you ready to go into space ?