A binary matroid is a matroid representable by the columns of a matrix over the two-element finite
field . A set of column labels
is independent in the matroid precisely when the corresponding
columns are linearly independent over
.
Every graphic matroid is binary. For example, the columns of the incidence matrix of a loopless
graph, interpreted over , represent its graphic
matroid. Binary representability depends on the field,
not merely on whether the entries of a representing matrix
are 0 and 1.