I just posted a preprint article, as the original approach to this topic.
Every critical remarks would be welcome.
Conservation of total energy can be expressed also for an open system, that is the fundamental thermodynamics law dE/dt=Wp-Qp.
This discussion is exceeded by the next one, and so may be finished.
At least some differential equations have the equivalent algebraic expressions. The sets of such (partial) equations are not excluded.
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