def tetrahedron_old(label=None):
next = Permutation(cycles=[((0,1),(0,3),(0,2)),
((1,2),(1,3),(1,0)),
((2,0),(2,3),(2,1)),
((3,0),(3,1),(3,2))])
opposite = Permutation(cycles=[((0,1),(1,0)),
((0,2),(2,0)),
((0,3),(3,0)),
((1,2),(2,1)),
((1,3),(3,1)),
((2,3),(3,2))])
if label:
return RibbonGraph([opposite.append_label(label), next.append_label(label)])
else:
return RibbonGraph([opposite, next])
def tetrahedron(label=None):
next = Permutation(cycles=[('01','02','03'),
('12','10','13'),
('20','21','23'),
('30','32','31')])
opposite = Permutation(cycles=[('01','10'),
('02','20'),
('03','30'),
('12','21'),
('13','31'),
('23','32')])
if label:
return RibbonGraph([opposite.append_label(label), next.append_label(label)])
else:
return RibbonGraph([opposite, next])
