By Newman M. F. (Ed)
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Extra resources for Topics in Algebra: Proceedings, 18th Summer Research Institute of the Australian Mathematical Society
Note that in (b), only one Dynkin diagram can ever arise from a seed in A: in other words, all orientations of a given Dynkin diagram (as valued quiver), are mutationally equivalent. 4. All orientations of a (finite) tree are mutationally equivalent via a sequence of mutations at sinks or sources only. Proof. We prove this by induction on the number of vertices, n. It is clearly true for one vertex, so suppose it is true for fewer than n vertices and let T be a tree with n vertices, with two orientations Q and Q0 .
The relations in this second line are sometimes referred to as the braid relations. i; j / terms on each side of the relation. The Artin braid group is thus a quotient of the corresponding reflection group. In type An , this gives a presentation of the usual braid group on n C 1 strings: ˇ ˇ D j i j ; ji j j D 1 B D 1 : : : nC1 ˇˇ i j i jj > 1 i j D j i ; ji and the symmetric group of degree †nC1 is a quotient via the map i 7! si . 5. [127, 160] Let W be a reflection group. Let w D si1 : : : sir D sj1 : : : sjr be reduced expressions for an element w 2 W .
Let w D si1 : : : sir D sj1 : : : sjr be reduced expressions for an element w 2 W . Then, there is a sequence of applications of braid relations taking the first expression to the second. 5, we never use the relation si2 D e. Note also that applying a braid relation to a reduced expression always gives another reduced expression. 2) are known as commutation relations. Two reduced expressions for an element w are said to be commutation equivalent if there is a sequence of commutations taking the first to the second.
Topics in Algebra: Proceedings, 18th Summer Research Institute of the Australian Mathematical Society by Newman M. F. (Ed)