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- W2951483774 abstract "Let $W$ be a finite reflection group. A $W$-invariant function of class~$C^{infty}$ may be expressed as a functions of class $C^{infty}$ of the basic invariants. In finite class of differentiability, the situation is not this simple. Let~$h$ be the greatest Coxeter number of the irreducible components of $W$ and $P$ be~the Chevalley mapping, if $f$ is an invariant function of class $C^{hr}$, and $F$ is the function of invariants associated by $f=Fcirc P$, then $F$ is of class $C^r$. However if~$F$ is of class $C^r$, in general $f=Fcirc P$ is of class $C^r$ and not of class $C^{hr}$. Here we determine the space of $W$-invariant functions that may be written as functions of class $C^r$ of the polynomial invariants and the subspace of functions $F$ of class $C^r$ of the invariants such that the invariant function $f=Fcirc P$ is of class $C^{hr}$." @default.
- W2951483774 created "2019-06-27" @default.
- W2951483774 creator A5073917515 @default.
- W2951483774 date "2019-06-15" @default.
- W2951483774 modified "2023-09-27" @default.
- W2951483774 title "Finite Reflection Groups: Invariant functions and functions of the Invariants in finite class of differentiability." @default.
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