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Reading a book on thermodynamics and the guy often uses something like this :

∫1/T dQ = ΔS

and then he says "this in differential form" :

dQ/T = dS

I kind of get the idea visually that one slice of "integral" will be dQ and you can think of it this way.

But my question is how do you mathematically express this conversion between delta <==> dX (both ways).

Some Examples would be nice.

thank you

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# Delta <=> dX

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