Geodesic
$\Sigma$-Hamiltonian and $\Sigma$-regular algebraic structures
Mathematica Bohemica, Tome 121 (1996) no. 2, pp. 177-182.

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The concept of a $\SS$-closed subset was introduced in [1] for an algebraic structure $\A=(A,F,R)$ of type $\t$ and a set $\SS$ of open formulas of the first order language $L(\t)$. The set $C_\SS(\A)$ of all $\SS$-closed subsets of $\A$ forms a complete lattice whose properties were investigated in [1] and [2]. An algebraic structure $\A$ is called $\SS$- hamiltonian, if every non-empty $\SS$-closed subset of $\A$ is a class (block) of some congruence on $\A$; $\A$ is called $\SS$- regular, if $\0=\F$ for every two $\0$, $\F\in\Con\A$ whenever they have a congruence class $B\in C_\SS(\A)$ in common. This paper contains some results connected with $\SS$-regularity and $\SS$-hamiltonian property of algebraic structures.
DOI : 10.21136/MB.1996.126108
Classification : 03E20, 04A05, 08A05, 08A30
Keywords: closure system; algebraic structure; $\SS$-closed subset; $\SS$-hamiltonian and $\SS$-regular algebraic structure; $\SS$-transferable congruence 
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Chajda, Ivan; Emanovský, Petr. $\Sigma$-Hamiltonian and $\Sigma$-regular algebraic structures. Mathematica Bohemica, Tome 121 (1996) no. 2, pp. 177-182. doi : 10.21136/MB.1996.126108. http://geodesic.mathdoc.fr/articles/10.21136/MB.1996.126108/

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