SOME PROPERTIES OF NETWORKS

In this paper, we investigate the following: (1) the product of cs - networks is cs-network, the product of cs ?-networks is cs ?-network, the image of cs-network by sequence-covering map is cs-network, the image of cs ?-network by 1-sequence-covering map is cs ?-network, the product of k-networks is a k-network, the image of k-network by compact-covering map is a k-network.