I always get slightly confused with the rules of differentials.(adsbygoogle = window.adsbygoogle || []).push({});

now [tex]\frac{d^{2}y}{dx^{2}}[/tex] is the scond derivative of the function y(x

but rooting this does NOT give the first derivative dy/dx

However, with the operator [tex]\frac{d^{2}}{dx^{2}}[/tex], it seems that you can root this and it DOES give the first derivative.

Can someone please explain this to me? I may be wrong, but this seems to be the case in my quantum mechanic notes

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# Differential operators - the rules

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