The structure of laminin antedates by many thousands of years traditional Christian accounts of the life of Jesus. A cross-like shape is a very simple structure that is commonly found in elements created naturally or accidentally.
Problem solving consists of using generic or ad hoc methods, in an orderly manner, for finding solutions to problems. Some of the problem-solving techniques developed and used in artificial intelligence, computer science, engineering, mathematics, or medicine are related to mental problem-solving techniques studied in psychology.
No idea how to solve differential equations analytically with matrices, however, numerically solving a differential equation definitely involves matrices. If we talk about partial differential equations and system of ordinary differential equations then there matrix method are used to solve homogeneous linear equations with constant coefficient.