Abstract
Tanabe [5] gives a geometrical proof of the existence of $\lim\frac{p(1,t)-1}{t}$ for a natural norm $p$ on ${\mathbb R}^2$. Following his idea, a shorter proof is given.
Funding Statement
The first author was supported by JSPS KAKENHI Grant Number 19K03536.
Acknowledgment
The authors are grateful to the referees for their valuable comments and suggestions which have contributed to the final preparation of the paper.
Citation
Osamu Hatori. Kyohei Tanabe. "Note on the proof of the existence of $D(p)$ of a theorem of Jarosz." Nihonkai Math. J. 30 (1) 27 - 29, 2019.
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