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APAL
1998
54views more  APAL 1998»
13 years 5 months ago
Computable Isomorphisms, Degree Spectra of Relations, and Scott Families
Bakhadyr Khoussainov, Richard A. Shore
JCT
2011
83views more  JCT 2011»
13 years 26 days ago
Sandpile groups and spanning trees of directed line graphs
Abstract. We generalize a theorem of Knuth relating the oriented spanning trees of a directed graph G and its directed line graph LG. The sandpile group is an abelian group associa...
Lionel Levine