english: Well, a man named Hausdorff in 1919 introduced a number which was just a mathematical joke, and I found that this number was a good measurement of roughness.
non_english: Nuž, istý Hausdorff v roku 1919 predstavil číslo, ktoré bolo len matematickým vtipom. A prišiel som na to, že toto číslo je dobrým meradlom drsnosti.