Symbol in context

$u_\alpha$

This entry links every published equation using this exact notation. Its meaning may change between equations.

Used in 3 equations

X^\mu(u,\Sigma) = \frac{\int_\Sigma x^\mu\, T^{\alpha\beta}u_\alpha\, d\Sigma_\beta}{\int_\Sigma T^{\alpha\beta}u_\alpha\, d\Sigma_\beta}.

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

u_\alpha

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

T^{\alpha\beta}u_\alpha\, d\Sigma_\beta

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.