Advances in Mathematics Research. Volume 15

Advances in Mathematics Research" presents original studies on the leading edge of mathematics. Each article has been carefully selected in an attempt to present substantial research results across a broad spectrum. Topics discussed herein include recent advances in the periodicity in dynamical systems; nonlinear differential equations and Fucik Spectrum; matrix theory; column and row determinants in quaternion linear algebra; elliptic perturbations of parabolic and hyperbolic problems and a discrete time (s,S) inventory system with service facility.