def circuits(self):
"""
Return the circuits.
Given a vector oriented matroid, the set of circuits is the set
`Min(V)` which denotes the set of inclusion-minimal (nonempty) signed
subsets.
"""
from sage.combinat.posets.posets import Poset
from oriented_matroids import OrientedMatroid
# remove 0
vecs = [v for v in self.vectors() if not v.is_zero()]
P = Poset([vecs, lambda x, y: x.is_restriction_of(y)])
return P.minimal_elements()
