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» Argument graphs and assumption-based argumentation
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JGAA
2010
128views more  JGAA 2010»
13 years 8 months ago
Intersection Graphs of Pseudosegments: Chordal Graphs
We investigate which chordal graphs have a representation as intersection graphs of pseudosegments. For positive we have a construction which shows that all chordal graphs that ca...
Cornelia Dangelmayr, Stefan Felsner, William T. Tr...
CPHYSICS
2007
91views more  CPHYSICS 2007»
13 years 9 months ago
Characteristics of networks in financial markets
We investigate the financial network of the Korea Stock Exchange (KSE) using numerical simulations and scaling arguments. The frequency of degree and the edge density for a real ...
Kyungsik Kim, Soo Yong Kim, Deock-Ho Ha
FLAIRS
2008
14 years 4 days ago
Graph Grammars: An ITS Technology for Diagram Representations
For many educational applications such as learning tools for argumentation, structured diagrams are a suitable form of external representation. However, student-created graphs pos...
Niels Pinkwart, Kevin D. Ashley, Vincent Aleven, C...
SIAMDM
2000
69views more  SIAMDM 2000»
13 years 9 months ago
Bounds for Dispersers, Extractors, and Depth-Two Superconcentrators
We show that the size of the smallest depth-two N-superconcentrator is (N log2 N/ log log N). Before this work, optimal bounds were known for all depths except two. For the upper b...
Jaikumar Radhakrishnan, Amnon Ta-Shma
SIAMDM
2008
115views more  SIAMDM 2008»
13 years 9 months ago
Rank-Width and Well-Quasi-Ordering
Robertson and Seymour (1990) proved that graphs of bounded tree-width are well-quasi-ordered by the graph minor relation. By extending their arguments, Geelen, Gerards, and Whittle...
Sang-il Oum