Why semisets?
Commentationes Mathematicae Universitatis Carolinae, Tome 14 (1973) no. 3, pp. 397-420.

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Classification : 02A05, 02D99, 02E05, 02K05, 02K10, 02K15, 03A05, 03E30, 03E70, 03F99
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Hájek, Petr. Why semisets?. Commentationes Mathematicae Universitatis Carolinae, Tome 14 (1973) no. 3, pp. 397-420. http://geodesic.mathdoc.fr/item/CMUC_1973__14_3_a1/