Manuel Abad

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A b s t r a c t. It is well known that the number of subalgebras of a Boolean algebra with n atoms is the number of partitions of an n-element set. In this note we characterize the subalgebras of a finite monadic Boolean algebra and we determine the cardinality of the set of such subalgebras. For a finite n-element set X, n ≥ 1, let N [X] denote the number(More)