41. The Poisson or the Poisson point process is a stochastic process that has different forms and definitions. 42. Other stochastic processes such as renewal and counting processes are studied in the theory of point processes. 43. Each organism " decides " which sex it will become during mating, through a stochastic process . 44. In the 1990s, Gallager's interests shifted back to information theory and to stochastic processes . 45. He pioneered the use of preferential attachment stochastic processes to explain the origin of power law distribution. 46. The concept appears in ergodic theory the study of stochastic processes and measure-preserving dynamical systems. 47. Yadrenko was the founder and the leader of a scientific school in random fields and stochastic processes . 48. He has made contributions in the areas of control theory, nonlinear control, and stochastic processes . 49. Furthermore, seemingly random changes in financial markets have motivated the extensive use of stochastic processes in finance. 50. The values of a stochastic process are not always numbers and can be vectors or other mathematical objects.