Imai and Is´eki [11] defined a class of algebras of type (2,0) called BCK-algebras
which generalizes on one hand the notion of algebra of sets with the set sub-
traction as the only fundamental non-nullary operation, on the other hand
the notion of implication algebra. The class of all BCK-algebras is a quasivariety.
Is´eki posed an interesting problem (solved by Wro´nski [16]) whether
the class of BCK-algebras is a variety. In connection with this problem, Komori
[10] introduced a notion of BCC-algebras, and Dudek [4] redefined the
notion of BCC-algebras by using a dual form of the ordinary definition in
the sense of Komori. Dudek and Zhang [6] introduced a new notion of ideals
in BCC-algebras and described connections between such ideals and congruences.
On the other hand, Jun and Xin [9] applied the notion of derivations
in ring and near-ring theory to BCI-algebras, and they also introduced a new
concept called a regular derivation in BCI -algebras. They investigated some
Imai and Is´eki [11] defined a class of algebras of type (2,0) called BCK-algebraswhich generalizes on one hand the notion of algebra of sets with the set sub-traction as the only fundamental non-nullary operation, on the other handthe notion of implication algebra. The class of all BCK-algebras is a quasivariety.Is´eki posed an interesting problem (solved by Wro´nski [16]) whetherthe class of BCK-algebras is a variety. In connection with this problem, Komori[10] introduced a notion of BCC-algebras, and Dudek [4] redefined thenotion of BCC-algebras by using a dual form of the ordinary definition inthe sense of Komori. Dudek and Zhang [6] introduced a new notion of idealsin BCC-algebras and described connections between such ideals and congruences.On the other hand, Jun and Xin [9] applied the notion of derivationsin ring and near-ring theory to BCI-algebras, and they also introduced a newconcept called a regular derivation in BCI -algebras. They investigated some
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