Cusped hyperbolic 3-manifolds constructed from 8 ideal tetrahedra cusped_8tet_o.txt : 12846 orientable manifolds cusped_8tet_n.txt : 2998 non-orientable manifolds The notation is essentially the same as Jeff Weeks's "terse triangulation" format, but with slightly more redundancy. Example: haabaabbcacccadcabbdbbdedcbfbcdgddaeadchcddgbebhbecfcfagafdhdgcha_ajajaaaaaadpaaco The initial "h" indicates "8 tetrahedra". Each of the subsequent 16 blocks of 4 letters is read: tet q face r is glued to tet s face t. For example, "aaba" indicates that tet 0 face 0 is glued to tet 1 face 0. The 16 letters after the underscore represent the corresponding gluing permutations, coded by the letters a through x according to lexicographic order of the standard numerical codes: a = 0 1 2 3 (the identity permutation) b = 0 1 3 2 c = 0 2 1 3 ........... w = 3 2 0 1 x = 3 2 1 0 Notes. (1) A reasonable attempt was made to ensure completeness of these lists, but as many steps were involved in the computations it is entirely possible that there are omissions. (2) The manifolds were distinguished using the canonical triangulation feature of SnapPea, and the manifolds are arranged in order of complexity of their canonical triangulations. Very occasionally, because of the limitations of machine accuracy, SnapPea can mis-identify a triangulation as being canonical (see Jeff's comments on this in the SnapPea source code); therefore it's possible that there are duplications in the lists of manifolds. (3) These manifolds have been incorporated into the Python version of SnapPea: M. Culler, N. M. Dunfield, and J. R. Weeks. SnapPy, a computer program for studying the geometry and topology of 3-manifolds, http://snappy.computop.org Morwen Thistlethwaite October 2010