Revision as of 00:23, 22 May 2015

Let $\mathbb{T}$ be a time scale. For $t \in \mathbb{T} \cap (0,\infty)$, define $$L_{\mathbb{T}}(t) = \displaystyle\int_1^t \dfrac{1}{\tau} \Delta \tau.$$

Properties

• $L^{\Delta}_{\mathbb{T}}(t) = \dfrac{1}{t}$
• $L_{\mathbb{T}}(1)=0$
• $L_{\mathbb{R}}(t)=\log(t)$
• $L_{\mathbb{T}}(\cdot)$ is increasing and continuous
• $L_{\mathbb{T}}(\sigma(t))=L_{\mathbb{T}}(t)+\mu(t)L_{\mathbb{T}}^{\Delta}(t)=L_{\mathbb{T}}(t)+\dfrac{\mu(t)}{t}$

References

Mozyrska, Dorota; Torres, Delfim F. M. The natural logarithm on time scales. J. Dyn. Syst. Geom. Theor. 7 (2009), no. 1, 41--48.