摘要: We define the braid groups of a two-dimensional orbifold and introduce conventions for drawing pictures. use these to realize Artin associated spherical Coxeter diagrams A n , B = C D affine as subgroups various simple orbifolds. The cases are new. In each case group is normal subgroup with abelian quotient; in all except quotient finite. also illustrate value our calculus by giving picture-proof basic properties Garside element an type .
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