For the start of 2005, we have selected some open problems and conjectures that were posed at the Oberwolfach meeting on Graph Theory in January 2005 (click here for the conference photo). Part 2 is ...
First, we show that the determinant of a given matrix can be expanded by its principal minors together with a set of arbitrary parameters. The enumeration of Hamiltonian cycles and paths in a graph is ...
Area-preserving mappings of an annulus occur as Poincare mappings of Hamiltonian systems; they were studied extensively by G. D. Birkhoff. Recently Aubry and Mather investigated the subclass of ...
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