The Degasperis–Procesi equation (DP) is one of several equations known to model important nonlinear effects such as wave breaking and shock creation. It is, however, a special property of the DP ...

Strict solutions u of genuinely nonlinear homogeneous hyperbolic equations in two independent variables with initial data f(x) of compact support become singular after a time interval of order |f|-1.

DURING secondary response, elicited in sensitized rabbits by means of intravenous injections of the homologous antigen, the number of plasma cells in the spleen increased considerably, simultaneously ...