形式级数Witt变换
The formal series Witt transform
摘要:
给定一个形式幂级数f(z),对于任意正整数r,我们定义其第r次Witt变换W_f^{(r)},公式为rW_f ^{(r)}(z)= sum_{d|r} mu(d)f(z^d)^{r/d},其中mu是Moebius函数。Witt变换推广了出现在分圆恒等式1-ay=prod(1-y^n)^{M(a,n)}中的项链多项式M(a,n),其中乘积覆盖所有正整数。建立了Witt变换的若干性质。一些有关的例子被认为是数论。
英文摘要:
Given a formal power series f(z) we define, for any positive integer r, its rth Witt transform, W_f^{(r)}, by rW_f^{(r)}(z)=sum_{d|r}mu(d)f(z^d)^{r/d}, where mu is the Moebius function. The Witt transform generalizes the necklace polynomials M(a,n) that occur in the cyclotomic identity 1-ay=prod (1-y^n)^{M(a,n)}, where the product is over all positive integers. Several properties of the Witt transform are established. Some examples relevant to number theory are considered.
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