Irreducible plane sextics with large fundamental groups
Journal of the Mathematical Society of Japan
Japan Society of Mathematical Education,Nippon Sugaku Kyoiku Gakkai
1131 - 1169
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We 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.