Page "Biased graph" Paragraph 18
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The frame matroid ( sometimes called bias matroid ) of a biased graph, M ( Ω ), ( Zaslavsky, 1989 ) has for its ground set the edge set E. An edge set is independent if each component contains either no circles or just one circle, which is unbalanced.
( In matroid theory a half-edge acts like an unbalanced loop and a loose edge acts like a balanced loop.
) M ( Ω ) is a frame matroid in the abstract sense, meaning that it is a submatroid of a matroid in which, for at least one basis, the set of lines generated by pairs of basis elements covers the whole matroid.
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