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Properties and Special Filters of Pseudocomplemented Posets
Ivan Chajda and Helmut Länger
Investigating the structure of pseudocomplemented lattices started ninety years ago with papers by V. Glivenko, G. Birkhoff and O. Frink and this structure was essentially developed by G. Grätzer. In recent years, some special filters in pseudocomplemented and Stone lattices have been studied by M. Sambasiva Rao. However, in some applications, in particular in non-classical logics with unsharp logical connectives, pseudocomplemented posets instead of lattices are used. This motivated us to develop an algebraic theory of pseudocomplemented posets, i.e. we derive identities and inequalities holding in such posets and we use them in order to characterize the so-called Stone posets. Then we adopt several concepts of special filters and we investigate their properties in pseudocomplemented posets. Moreover, we show how properties of these filters influence algebraic properties of the underlying pseudocomplemented posets.
Keywords: Poset, pseudocomplemented poset, Stone poset, Stone identity, filter, coherent filter, strongly coherent filter, closed filter, prime filter, median filter
AMS Subject Classification: 06A11, 06A15, 06D15