Counting equations is dubious. Is dx^2/dt^2 = c one or two equations? The fact that this paper is written in Word doesn't help it. I have never heard of apply

Counting equations is dubious. Is dx^2/dt^2 = c one or two equations? The fact that this paper is written in Word doesn't help it. I have never heard of applying Pearson-Coefficients for system identification like that. This paper smells like someone applying insufficient math to a problem. The world is not linear. In fact the human body also requires Algebraic constraints. This is just a bad paper.