Bases for the derivation modules of two-dimensional ~multi-Coxeter arrangements and universal derivations
Bases for the derivation modules of two-dimensional ~multi-Coxeter arrangements and universal derivations
复制标题
二维 ~multi-Coxeter 排列的推导模块和通用推导的基础
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发表时间:
2010
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通讯作者:
Atsushi Wakamiko
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作者:
Atsushi Wakamiko
Let $A$ be an irreducible Coxeter arrangement and $fk$ be a multiplicity of $A$. We study the derivation module $D(A, fk)$. Any two-dimensional irreducible Coxeter arrangement with even number of lines is decomposed into two orbits under the action of the Coxeter group. In this paper, we will {explicitly} construct a basis for $D(A, fk)$ assuming $fk$ is constant on each orbit. Consequently we will determine the exponents of $(A, fk)$ under this assumption. For this purpose we develop a theory of universal derivations and introduce a map to deal with our exceptional cases.