In order to investigate the regularities of the aging of the organisms, the concept of the space of life-cycle-states of a living system is introduced. A mathematical model based on a number of general assumptions makes it possible to estimate the dimension of this space, to determine the motion...

Looking at survival in terms of biological indicators of aging has given rise to various models of mortality, some of which we review here. The most notable models are that of Strehler and Mildvan, which relates the force of mortality to the ability of organisms to compensate for stress, and...