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**dE_logics** Indefinite integral is simply 'reverse differential' right?...that's why dx needs to be necessarily present, since you can reverse differentiate only a differential equation.

In indefinite integral its necessary not to have an infinitesimally term, since a real life function with this term is awkwardness...it has no meaning.

So if suppose, the area of the differentiated equation yields the desired result, then we gotta take the infinitesimally terms to one side, and take a another function...like dy/dx = z(x) or n

This is an assertion, so I would like to confirm.