Kirjahaku

The equations which we are going to study in these notes were first presented in 1963 by E. N. Lorenz. They define a three-dimensional system of ordinary differential equations that depends on three real positive parameters. As we vary the parameters, we change the behaviour of the flow determined by the equations. For some parameter values, numerically computed solutions of the equations oscillate, apparently forever, in the pseudo-random way we now call "chaotic"; this is the main reason for the immense amount of interest generated by the equations in the eighteen years since Lorenz first presented them. In addition, there are some parameter values for which we see "preturbulence", a phenomenon in which trajectories oscillate chaotically for long periods of time before finally settling down to stable stationary or stable periodic behaviour, others in which we see "intermittent chaos", where trajectories alternate be­ tween chaotic and apparently stable periodic behaviours, and yet others in which we see "noisy periodicity", where trajectories appear chaotic though they stay very close to a non-stable periodic orbit. Though the Lorenz equations were not much studied in the years be­ tween 1963 and 1975, the number of man, woman, and computer hours spent on them in recent years - since they came to the general attention of mathematicians and other researchers - must be truly immense.

In twenty-five years, Greeves produced around 25,000-30,000 machines - a number considered relatively modest when compared with some of their contemporaries, such as Triumph. However, Greeves was not small in ambition, or indeed achievement, which is resoundingly illustrated in this new book. From a tentative start in the early 1950s, Greeves expanded through the 1960s, producing scrambler, trials, road racing and road bikes. Founders Bert Greeves and Derry Preston Cobb produced machines from their factory at Thundersley in Essex, establishing a world-wide reputation in motorcycle sport, particularly off-road competition. Greeves - The Complete Story gives a detailed history from the early 1950s to the 1970s. With production histories and specification details for all the main models, and hundreds of photographs throughout, it is the ideal resource for anyone with an interest in these classic sporting motorcycles.