Well, it depends on what state you’re in but most kids in the United States start school at about six when they go to elementary school and that goes from the first grade up to the sixth grade. Some kids go to a kindergarten the year before that. Then they go on to junior high s...
In Section 2, we analyse the diffusive movement of a particle in a three-dimensional comb-like structure, where instead of Brownian motion as it is considered in Ref. [20], the diffusion is governed by the O-U processes on the backbone (x-direction) and the main fingers (y-direction),...