, Volume 82, Issue 1, pp 77-88

The lower central series of a fiber-type arrangement

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Summary

For a certain class (“fiber-type”) of arrangements, including the supersolvable ones of Jambu and Terao [3], we prove a formula relating the Poincaré polynomial of the complement with the ranks of successive quotients in the lower central series of the fundamental group. Such a formula was proved by Kohno [5] for the single family of examplesA l .

We also show that the formula doesnot hold for allK(π, 1) arrangements.

Second author partially supported by NSF grant