经典Weierstrass函数图形维数的一个初等证明
An elementary proof for the dimension of the graph of the classical Weierstrass function
摘要:
设$W_{λ,b}(x)=\sum_{n=0}^\inftyλ^n g(b^n x)$,其中$b\geqslant2$是整数,$g(u)=\cos(2πu)$(经典Weierstrass函数)。在Ledrappier(1992),Baránsky,Bárány and Romanowska(2013)和Tsujii(2001)工作的基础上,我们提供了一个初等证明,对于所有具有合适$λ_b<1$的$λ\in(λ_b,1)$,$W_{λ,b}$的豪斯多夫维数等于$2+\frac{\logλ}{\log b}$。这再现了Baránsky,Bárány和Romanowska的结果,而没有使用Ledrappier和Young(1985,1988)的双曲测度的维数论,它被一个简单的伸缩论证和递归多尺度估计所取代。
英文摘要:
Let $W_{λ,b}(x)=\sum_{n=0}^\inftyλ^n g(b^n x)$ where $b\geqslant2$ is an integer and $g(u)=\cos(2πu)$ (classical Weierstrass function). Building on work by Ledrappier (1992), Baránsky, Bárány and Romanowska (2013) and Tsujii (2001), we provide an elementary proof that the Hausdorff dimension of $W_{λ,b}$ equals $2+\frac{\logλ}{\log b}$ for all $λ\in(λ_b,1)$ with a suitable $λ_b<1$. This reproduces results by Baránsky, Bárány and Romanowska without using the dimension theory for hyperbolic measures of Ledrappier and Young (1985,1988), which is replaced by a simple telescoping argument together with a recursive multi-scale estimate.
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