I was watching a video explaining Einsteins field equations for beginners and he was giving some information on Vectors before he gets into the actual equations. He got to this equation:(adsbygoogle = window.adsbygoogle || []).push({});

I'm real confused, how does he know that dx and dø are both? Why does dø change to dy? What does the equation even mean? Please help I can't continue the video because I'm real confused on his part.

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# B Vectors and gradients

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