Mathematical considerations regarding the stability of trace elements systems by polynomial regressions

In this paper we generalise the mathematical model which describes the stab ility conditions of the human body considered as a big cybernetic system th at lives in the normal condition by feed-back. Starting by a linear approxi mation,(7) we generalise the stability's conditions in the polynomial case of dependencies between trace elements determined in organs of the human bo dy. We tested this model on traces of Fe, Zn and Co. These elements were de termined in breast tissues samples which have different diseases.