We prove that there is no functorial universal finite type invariant for braids in Sigma x I if the genus of Sigma is positive. (C) 2003 Published by Elsevier SAS on behalf of Academie des sciences.
机构:
Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, SloveniaUniv Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia
Copar, Simon
Zumer, Slobodan
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机构:
Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia
Jozef Stefan Inst, Ljubljana 1000, SloveniaUniv Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia