Abstract
We describe the complex global structure of giant components in directed
multiplex networks which generalizes the well-known bow-tie structure, generic
for ordinary directed networks. By definition, a directed multiplex network
contains vertices of one kind and directed edges of m different kinds. In
directed multiplex networks, we distinguish a set of different giant components
based on inter-connectivity of their vertices, which is understood as various
directed paths running entirely through edges of distinct types. If, in
particular, \$m = 2\$, we define a strongly viable component as a set of
vertices, in which each two vertices are interconnected by two pairs of
directed paths, running through edges of each of two kinds in both directions.
We show that in this case, a directed multiplex network contains, in total, 9
different giant components including the strongly viable component. In general,
the total number of giant components is \$3^m\$. For uncorrelated directed
multiplex networks, we obtain exactly the size and the birth point of the
strongly viable component and estimate the sizes of other giant components.
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