`Coxeter`

### Kazhdan-Lusztig polynomials with unequal parameters

The program contains a full implementation of the computation of
Kazhdan-Lusztig polynomials with unequal parameters (see [1] or [2]), and, for
finite groups, of the corresponding cells.

The computation is considerably slower and more memory-intensive then the
equal-parameter case; for instance, for the cell compuations, the case of B6
is already fairly hard, and B7 seems to be at the edge of the possibilities
of present-day workstations. The case of F4, on the other hand, doesn't pose
any problems.

[1] |
G. Lusztig, *Hecke algebras with unequal parameters*, CRM Monographs
Ser. 18, Amer.Math.Soc. 2003, 136p. |

[2] |
M. Geck, G, Pfeiffer, *Characters of finite Coxeter Groups and
Iwahori-Hecke Algebras*, LMS Society Monographs (N.S.) 21, Clarendon Press,
Oxford, 2000. |

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