tetrahedron
V=4 E=6 F=4
convex, no coplanar faces · symmetry *332 · Eisenstein: tet T=1 (1,0)
Models can be manipulated.
Eisenstein family tet — red this net, blue ancestors, green descendants, grey cousins; mirror sector below the axis (reflections lumped); dashed ray = the Z-multiples. · family map, from the unit’s point of view