Broadcast and slepian-wolf multicast over Aref networks

We consider source coding over Aref networks. In particular we consider the following two problems: (i) multicasting correlated sources to a set of receivers, (ii) broadcasting sources to their respective receivers. For the first problem we show necessary and sufficient conditions for reliable multicast. For the second problem we show sufficient conditions for reliable broadcast. We further show that these conditions are also necessary when the sources are independent.