Degtyarev, A.2016-02-082016-02-0820090025-5645http://hdl.handle.net/11693/22599We compute the fundamental group of the complement of each irreducible sextic of weight eight or nine (in a sense, the largest groups for irreducible sextics), as well as of 169 of their derivatives (both of and not of torus type). We also give a detailed geometric description of sextics of weight eight and nine and of their moduli spaces and compute their Alexander modules; the latter are shown to be free over an appropriate ring. © 2009 The Mathematical Society of Japan.EnglishFundamental groupPlane sexticTorus typeTrigonal curveArticle10.2969/jmsj/061411311881-1167