منابع مشابه
Linearity for Actions on Vector Groups
Let k be an arbitrary field, let G be a (smooth) linear algebraic group over k, and let U be a vector group over k on which G acts by automorphisms of algebraic groups. The action of G on U is said to be linear if there is a G-equivariant isomorphism of algebraic groups U ' Lie(U). Suppose that G is connected and that the unipotent radical of G is defined over k. If the G-module Lie(U) is simpl...
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To understand what a braid group is, it is easiest to visualize a braid. Consider n strands, all parallel. Consider taking the ith strand and crossing it over the i+ 1th strand. This is an example of a braid. In general, a braid is any sequence of crossings of the bands, provided none of the bands are selfcrossing. For instance, a loop, or a band which forms a loop in the middle, is not a braid...
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ژورنال
عنوان ژورنال: Journal of Algebra
سال: 2014
ISSN: 0021-8693
DOI: 10.1016/j.jalgebra.2013.08.030