Source: Notre Dame J. Formal Logic Volume 37, Number 2
(1996), 204-232.
This paper investigates modular combinations of temporal logic systems.
Four combination methods are described and
studied with respect to the transfer of logical properties
from the component one-dimensional temporal logics to the
resulting combined two-dimensional temporal logic. Three basic logical
properties are analyzed, namely soundness, completeness, and
decidability. Each combination method comprises three submethods that
combine the languages, the inference systems, and the semantics
of two one-dimensional temporal logic systems, generating
families of two-dimensional temporal languages with varying
expressivity and varying degrees of transfer of logical
properties. The temporalization method and the
independent combination method are shown to transfer
all three basic logical properties. The method of full
join of logic systems generates a considerably more
expressive language but fails to transfer completeness and
decidability in several cases. So a weaker method of restricted join is proposed and shown to transfer all three basic logical properties.
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