In the http://en.wikipedia.org/wiki/Hamilton's_principle#Mathematical_formulation", I ran across a notation I'm not familiar with. The part I'm unsure about is:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\frac{\delta \mathcal{S}}{\delta \mathbf{q}(t)}=0[/itex]

In the context of the article, what is the meaning of that equation?

Thanks!

(My math background goes up to multivariable calculus.)

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# Question about notation: lowercase delta in what appears to be a derivative

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