The circle in our explanation is closed as well system of coding and decoding in the brain. The brain must solve differential equations and analog computers solve differential equations. Analog computer use integration to solve differential equations. The answer is not very simple. We must realize that that coding and decoding process in the brain creates feedback system that we can describe using matrix.
Matrix multiplication is basic operation that can describe function of the brain.
To make feedback system we have to close loop using the following equation. Both equations show processing in the brain. My book evidences that both equations can solve integration although there is no integration in these two equations. The evidence is based on the numerical integrating method using Taylor series as its base formula. The numerical method allows filling all cells of matrix M so the given differential equation is solved.