Nonlinear phenomena are phenomena, which, in contrast to a linear system, cannot be explained by a mathematical relationship of proportionality (that is, a linear relationship between two variables).

WHEN materials of different kinds are subjected to mechanical actions we may observe a great variety of rheological phenomena, and we shall confine our attention here to a certain group of them ...

If the broader themes don’t vary much, though, the styles do. Side Quest’s anthology structure — none of these self-contained arcs have anything to do with the others, and aside from “Song ...

Arnold's tongues are observed in a large variety of natural phenomena that involve oscillating quantities, such as heartbeats, pendulum swings or flashing lights. Theoretical studies have ...