In this paper there are three
main results:
I. An orthomodular poset with property C is essentially the same as an
associative partial Boolean algebra.
II. If P is an orthomodular poset, then S(P), the set of residuated maps on P,
can be made into a weak partial Baer∗-semigroup is such a way that P is isomorphic
to the orthomodular poset of closed projections in S(P).
III. If (P,M) is a conditional quantum logic, then the collection of all finite
compositions of primitive operations (satisfying certain technical conditions) is a
partial Baer∗-semigroup.
It is assumed that the reader is familiar with the rudiments of the theory of
orthomodular posets.
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