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Unifiability of terms (and formulas) and structural completeness in the variety of relation algebras RA and in the products of modal logic S5 is investigated. Nonunifiable terms (formulas) which are satisfiable in varieties (in logics) are exhibited. Consequently, RA and products of S5 as well as representable diagonal-free n-dimensional cylindric algebras, RDfn, are almost structurally complete but...
This paper presents a model of dynamic, discrete decision-making problem (finite
number of periods, states and decision variables). Described process has returns in random
variables spaces equipped with partial order. The model can be applied for many multi-stage,
multi-criteria decision making problems. There are a lot of order relations to compare random
variables. Properties of those structures...
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