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13.
NZ-flows in strong products of graphs
Imrich, Wilfried ...
Za krepki produkt ▫$G_1 \boxtimes G_2$▫ grafov ▫$G_1$▫ in ▫$G_2$▫ dokažemo, da je ▫${\mathbb{Z}}_3$▫-pretočno kontraktibilen natanko tedaj, ko ▫$G_1 \boxtimes G_2$▫ ni izomorfen ▫$T\boxtimes K_2$▫ ...(kar poimenujemo ▫$K_4$▫-drevo), kjer je ▫$T$▫ drevo. Sledi, da za ▫$G_1 \boxtimes G_2$▫ obstaja NZ 3-pretok, razen če je ▫$G_1 \boxtimes G_2$▫ ▫$K_4$▫-drevo. Dokaz je konstruktiven in implicira polinomski algoritem, ki nam vrne NZ 3-pretok, če ▫$G_1 \boxtimes G_2$▫ ni ▫$K_4$▫-drevo, oziroma NZ 4-pretok sicer.
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