Посилання:Flows in graphs and the homology of free categories / A.A. Husainov, H. Calısıcı // Algebra and Discrete Mathematics. — 2003. — Vol. 2, № 2. — С. 36–46. — Бібліогр.: 8 назв. — англ.
Підтримка:Research is supported by RF grant center at Novosibirsk State University in Russia
and by TUB¨ ˙ITAK and NATO in Turkey
We study the R−module of generalized flows in a
graph with coefficients in the R−representation of the graph over
a ring R with 1 and show that this R−module is isomorphic to the
first derived functor of the colimit. We generalize Kirchhoff’s laws
and build an exact sequence for calculating the R−module of flows
in the union of graphs.