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TPHOL
2007
IEEE
16 years 27 days ago
Proof Pearl: De Bruijn Terms Really Do Work
Placing our result in a web of related mechanised results, we give a direct proof that the de Bruijn λ-calculus (`a la Huet, Nipkow and Shankar) is isomorphic to an α-quotiented ...
Michael Norrish, René Vestergaard
ILC
2007
Springer
16 years 24 days ago
A Playful Glance at Hierarchical Questions for Two-Way Alternating Automata
Two-way alternating automata were introduced by Vardi in order to study the satisfiability problem for the modal µ-calculus extended with backwards modalities. In this paper, we ...
Jacques Duparc, Alessandro Facchini
SUM
2007
Springer
16 years 23 days ago
Valued Hesitation in Intervals Comparison
Abstract. The paper presents a valued extension of the recently introduced concept of PQI interval order. The main idea is that, while comparing objects represented by interval of ...
Meltem Öztürk, Alexis Tsoukiàs
WG
2007
Springer
16 years 22 days ago
The Complexity of Bottleneck Labeled Graph Problems
Abstract. We present hardness results, approximation heuristics, and exact algorithms for bottleneck labeled optimization problems arising in the context of graph theory. This long...
Refael Hassin, Jérôme Monnot, Danny S...
LICS
2006
IEEE
16 years 20 days ago
A Congruence Rule Format for Name-Passing Process Calculi from Mathematical Structural Operational Semantics
d Abstract) Marcelo Fiore∗ and Sam Staton† Computer Laboratory, University of Cambridge We introduce a mathematical structural operational semantics that yields a congruence r...
Marcelo P. Fiore, Sam Staton