I'm studying calculus III topics on my own, but I've seen this notation prop up a lot. Could you tell me what it means?(adsbygoogle = window.adsbygoogle || []).push({});

http://en.wikipedia.org/wiki/Exact_differential

The notation on this page, it has this notation:

[tex]( \frac{dA}{dx} )_y = ( \frac{dB}{dy} )_x[/tex]

What do the x's and y's mean as subscript of the parenthesis? Just plug in the y value at that point into that derivative's equation?

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# Multivariable calc help

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