"tensions; flows; contractor; Fourier transform; Graph homomorphism"@en . "We answer a question raised by Lovasz and B. Szegedy [Contractors and connectors in graph algebras, J. Graph Theory 60:1 (2009)] asking for a contractor for the graph parameter counting the number of B-flows of a graph, where B is a subset of a finite Abelian group closed under inverses. We prove our main result using the duality between flows and tensions and finite Fourier analysis."@en . "Contractors for Flows"@en . "P(1M0545), P(GBP202/12/G061), P(LL1201)" . . "0002-9939" . "Goodall, Andrew" . . . . . "Contractors for Flows" . "[FB663022129E]" . "141" . "66907" . "Contractors for Flows"@en . "Ne\u0161et\u0159il, Jaroslav" . . . "Garijo, Delia" . . . "13"^^ . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "Contractors for Flows" . . "Proceedings of the American Mathematical Society" . . . "10.1090/S0002-9939-2012-11449-2" . "Goodall, Andrew" . "RIV/00216208:11320/13:10173147!RIV14-GA0-11320___" . "RIV/00216208:11320/13:10173147" . . . "000326571400001" . "3"^^ . "6" . . . "11320" . "2"^^ . "We answer a question raised by Lovasz and B. Szegedy [Contractors and connectors in graph algebras, J. Graph Theory 60:1 (2009)] asking for a contractor for the graph parameter counting the number of B-flows of a graph, where B is a subset of a finite Abelian group closed under inverses. We prove our main result using the duality between flows and tensions and finite Fourier analysis." . . . . .