# The lines() method only returns one generator per line. For a true
# line, we also need a generator pointing in the opposite direction.
S_gens = [ direction*gen for direction in [1,-1] for gen in K.lines() ]
- S = Cone(S_gens, K.lattice())
+ S = Cone(S_gens, K.lattice(), check=False)
# Since ``S`` is a subspace, the rays of its dual generate its
# orthogonal complement.
- S_perp = Cone(S.dual(), K.lattice())
+ S_perp = Cone(S.dual(), K.lattice(), check=False)
P = K.intersection(S_perp)
return (P,S)