Mickey Mouse universe instead; both in "Mickey Mouse Adventures" and in Disney's contemporary reprints of vintage stories in "Walt Disney's Comics and Stories" (1991–93). Later publisher Gemstone and the present Boom Studios have continued the use of Mouseton from 2003 onward. Strangely, in-between licensee Gladstone (1993–99) usually left Mickey's city unnamed, or—very rarely—referenced it as Duckburg, better known as Donald Duck's hometown. Mouseton's location in Calisota and its positioning with regard to Duckburg (the cities being next to one another) were the subject of speculation early on, but have generally been treated consistently in American publications from 2003 onward. In Disney comics published
Random walk fact that the boundary of the trajectory of a Wiener process is a fractal of dimension 4/3, a fact predicted by Mandelbrot using simulations but proved only in 2000 by Lawler, Schramm and Werner. A Wiener process enjoys many symmetries random walk does not. For example, a Wiener process walk is invariant to rotations, but the random walk is not, since the underlying grid is not (random walk is invariant to rotations by 90 degrees, but Wiener processes are invariant to rotations by, for example, 17 degrees too). This means that in many cases, problems on a random walk are