Abstract
Nonlinear phenomena have given rise to several outstanding branches of research in phy-sics. Theories and phenomena of nonlinear oscillation, dynamics of competing biological species, hydrodynamics, water waves and waves in nonlinear lattices are explained in some detail. It seems that nonlinearity in many cases causes accumulation of energy as in the case of solitons in nonlinear waves, and stabilization leading to final state as in the case of limit cycle in nonlinear oscillation.
