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APAL
2010
90views more  APAL 2010»
13 years 5 months ago
Canonical extensions for congruential logics with the deduction theorem
We introduce a new and general notion of canonical extension for algebras in the algebraic counterpart AlgS of any finitary and congruential logic S. This definition is logic-base...
Mai Gehrke, Ramon Jansana, Alessandra Palmigiano
APAL
2005
154views more  APAL 2005»
13 years 4 months ago
A Sahlqvist theorem for distributive modal logic
In this paper we consider distributive modal logic, a setting in which we may add modalities, such as classical types of modalities as well as weak forms of negation, to the fragm...
Mai Gehrke, Hideo Nagahashi, Yde Venema
CORR
2011
Springer
151views Education» more  CORR 2011»
12 years 8 months ago
A New Representation Theorem for Many-valued Modal Logics
We propose a new definition of the representation theorem for many-valued logics, with modal operators as well, and define the stronger relationship between algebraic models of ...
Zoran Majkic
CORR
2010
Springer
118views Education» more  CORR 2010»
13 years 5 months ago
A view of canonical extension
Abstract. This is a short survey illustrating some of the essential aspects of the theory of canonical extensions. In addition some topological results about canonical extensions o...
Mai Gehrke, Jacob Vosmaer
CADE
2008
Springer
13 years 7 months ago
LogAnswer - A Deduction-Based Question Answering System (System Description)
LogAnswer is an open domain question answering system which employs an automated theorem prover to infer correct replies to natural language questions. For this purpose LogAnswer o...
Ulrich Furbach, Ingo Glöckner, Hermann Helbig...