Propositions are abstract entities; they do not exist in space and time. They are sometimes said to be "timeless", "eternal", or "omnitemporal" entities. Terminology aside, the essential point is that propositions are not concrete (or material) objects. Nor, for that matter, are they mental entities; they are not "thoughts" as Frege had suggested in the nineteenth century. The theory that propositions are the bearers of truth-values also has been criticized. Nominalists object to the abstract character of propositions. Another complaint is that it's not sufficiently clear when we have a case of the same propositions as opposed to similar propositions. This is much like the complaint that we can't determine when two sentences have exactly the same meaning. The relationship between sentences and propositions is a serious philosophical problem.
Philosophical theories on the nature of truth , by Bradley Dowden and Norman Swartz.
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Computational semantics is focused on the processing of linguistic meaning. In order to do this concrete algorithms and architectures are described. Within this framework the algorithms and architectures are also analyzed in terms of decidability, time/space complexity, data structures that they require and communication protocols.