[Paper link](https://arxiv.org/pdf/1903.01426.pdf)
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On page 4, I am trying to understand what equations 1, 3, and 4 mean. From my understanding, equation 3 comes from the first law of thermodynamics, but could someone what they all describe?
In: Physics
(1) is the evolution of momentum in time, wich is basically the sum of all (newtonian) forces.
(2) is the evolution of internal energy (thermal energy for laymen) so basically the balance of heating and cooling.
These are typically the most fundamental equations to describe ANY system, so the equations depend entirely on what kind of effects you’re studying in specific
Without knowing your background it will be hard to ELI5 the details though.
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