I was wondering. May the source and sink have in-out going edges in a flow-network, and if so - does Ford-Fulkerson and the max-flow min-cut theorem apply ?
Flow-networks are always pictures with no edges entering source, and no edges leaving sink.
I've tried to search the web for an answer, but did not come across an answer i fully understand. Also, I've yet to see a flow network pictured with these edges from source/sink.
Could I transform an undirected graph into a flow-network ? This network will have edges going into source and edges leaving sink ?? This hypothesis is the reason for my question.