# Questions tagged [covariance]

How a quantity behaves under a change of basis vectors. This tag covers relativistic covariance, as well as contravariant and covariant tensors not necessarily in the context of relativity. DO NOT USE THIS TAG for statistical covariance.

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### Special Relativity: are these postulates equivalent?

At the beginning of the developing of special relativity the following principles are assumed true: Principle 1: every physical law is equal in form in every inertial frame. Principle 2: there is a ...
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### About general covariance

\begin{equation} u^{\mu}=\frac{d}{d\tau}x^{\mu} \end{equation} \begin{equation} \partial_{\lambda}(u_{\nu} u^{\nu}) = (\partial_{\lambda}u_{\nu}) u^{\nu} + u_{\nu}(\partial_{\lambda}u^{\nu}) = 0 \end{...
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### Understanding tensor and covariance

I'm really struggling to understand the use of tensors when we want to have a covariant equation. From what I understand, if we write an equation using tensors only, then the physics behind it will be ...
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