@tiago May I ask a basic network question?
Just read this def.: "A network is defined by a pair (V, Epsilon), where V is a certain set and Epsilon = {E0; E1, E2, ..} is a family of collection of elements from V. The elements in the sets Ei element of Epsilon can, in general, be repeated. The elements of V are called the vertices of the network, those of E0 its poles and the collections Ei, its edges." --- I can't find examples of networks with poles, to get a clearer understanding of /visualize the concept of a pole vs edges. Any links? Thanks in advance.

@FroehlichMarcel I'm not sure I'm familiar with this definition of network with poles, to be honest. I've never seen it before. In which context does it appear?

@tiago
encyclopediaofmath.org/index.p
I found it here and thought it is sth. everyone is aware of except me :-) So if you don't know it, I stop worrying, likely not that relevant.

@tiago Seems to be simply a set of marked vertices, for whatever reason.

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