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Relative sets and rough sets

Amin Mousavi, Parviz Jabedar-Maralani (2001)

International Journal of Applied Mathematics and Computer Science

In this paper, by defining a pair of classical sets as a relative set, an extension of the classical set algebra which is a counterpart of Belnap's four-valued logic is achieved. Every relative set partitions all objects into four distinct regions corresponding to four truth-values of Belnap's logic. Like truth-values of Belnap's logic, relative sets have two orderings; one is an order of inclusion and the other is an order of knowledge or information. By defining a rough set as a pair of definable...

Revealed automorphisms

Jiří Sgall, Antonín Sochor (1991)

Commentationes Mathematicae Universitatis Carolinae

We study automorphisms in the alternative set theory. We prove that fully revealed automorphisms are not closed under composition. We also construct some special automorphisms. We generalize the notion of revealment and Sd-class.

Revealments

Antonín Sochor, Petr Vopěnka (1980)

Commentationes Mathematicae Universitatis Carolinae

Simple motions

Athanossios Tzouvaras (1989)

Commentationes Mathematicae Universitatis Carolinae

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