A hodgepodge of logic-related papers that have come across my virtual desk these last few weeks.
First though, I should mention the collection of online tutorials and textbooks on logic, both introductory and advanced, that Henri Galinon posted at the Theoreme Logic Toolbox. These include books on model theory, the theory of truth, modal logic, conditional logic, proof theory and substructural logics, many-valued logics, and linguistic applications. (Courtesy of Richard Zach from LogBlog)
Dosen and Petric have a paper out on arXiv on coherence for modalities: "Abstract: Positive modalities in systems in the vicinity of S4 and S5 are investigated in terms of categorial proof theory. Coherence and maximality results are demonstrated, and connections with mixed distributive laws and Frobenius algebras are exhibited."
The BEATCS concurrency column, edited by Luca Aceto, presents an article by Dale Miller on operational semantics specifications in logic, showing that "specifications written in SOS, abstract machines, and multiset rewriting, are closely related to Horn clauses, binary clauses, and (a subset of) linear logic, respectively." Plus a host of other interesting things, too.
Beyersdorff et al have a paper out on the complexity of common decision problems for propositional default logic, where they systematically restrict the set of allowed propositional connectives. Probably interesting if you care about default logic in practice.
Dov Gabbay and Karl Schlechta give an overview of logical and semantical rules for nonmonotonic and related logics.