- #1

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does anybody here know a proof for the chain rule:

[tex]\delta S= \frac{dS}{dx} \delta x[/tex]

and for the formulation:

[tex]\delta S= p \delta x[/tex]

=> [tex]\frac{dS}{dx}= p [/tex]

it would be totally sufficient, if anyone here knows(e.g. a weblink) where one could see this proof.