Signed graph

There are eight ways that signs can be assigned to the sides of a triangle. An odd number of negative signs makes an unbalanced triangle, Fritz Heider said.

In the area of graph theory in mathematics, a signed graph is a graph in which each edge has a positive or negative sign.

Two fundamental questions about a signed graph are: Is it balanced? What is the largest size of a balanced edge set in it? The first question is not difficult; the second is computationally intractable (technically, it is NP-hard).

单词	Signed graph
释义	Signed graph 英语百科 Signed graph In the area of graph theory in mathematics, a signed graph is a graph in which each edge has a positive or negative sign. Two fundamental questions about a signed graph are: Is it balanced? What is the largest size of a balanced edge set in it? The first question is not difficult; the second is computationally intractable (technically, it is NP-hard).
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