Well, I have a problem: if x is an independent argument so is
$$dx^2 = (dx)^2$$
?
Or if $z = z(x, y)$ is $dz^2 = (dz)^2$?
If not, why? I really can't understand it.
2026-03-28 03:27:44.1774668464
Does square of differential of argument is the same as differential of differential of square of argument?
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