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math.LO2013★ 2 cited
On commutative weak BCK-algebras
Janis Cirulis
The class of weak BCK-algebras is obtained by weakening one of standard BCK axioms. It is known that every weak BCK-algebra is completely determined by the structure of its initial…
math.OA2013★ 3 cited
Further remarks on an order for quantum observables
J. Cirulis
S. Gudder and, later, S. Pulmanova and E. Vincekova, have studied in two recent papers a certain ordering of bounded self-adjoint operators on a Hilbert space. We present some furt…