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Keywords:
subtraction algebra; subtraction semigroup; implicative $BCK$-algebra; $BCI$-semigroup
subtraction algebra; subtraction semigroup; implicative $BCK$-algebra; $BCI$-semigroup
Summary:
In this note we show that a subtraction algebra is equivalent to an implicative $BCK$-algebra, and a subtraction semigroup is a special case of a $BCI$-semigroup.
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