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You claim that a mathematical procedure that is correct for mathematical reasons is also correct for physical reasons.
If one has an equation with a '=' in the middle then one can alway substract or add a number left and right from the '=' sign.
If one wants to differentiate (taking a parameter p), left and right of the '=' sign , then that would be correct for mathematical reasons but also correct for physical reasons.
If a scientist states that one cannot differentiate this (dE = F dx) equation taking the time t, then one simply writes it all out.
If a scientist states that the product rule ( d(gh) = hdg + gdh ) is not valid for dE = F dx, then one simply writes it all out.
Please do this for me.
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