Does anyone know the physical (or historical) basis for the terms covariant and contravariant?(adsbygoogle = window.adsbygoogle || []).push({});

I'm guessing a particular class of mapping always tranforms components (of ..?) in exactly two different ways, so I'm wondering what the mappings are (Change of coordinate charts? Lorentz transform?) and what it is that "covariant" things vary in common with?

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# Covariant vs. contravariant

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