Symbol in context

$U^2$

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

Used in 6 equations

\Gamma^i_{00} = U^2\phi_{,i}

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

\partial_j(U^2\phi_{,i}) = U^2\phi_{,i}\phi_{,j} + U^2\phi_{,ij}

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

\Gamma^i_{00}\Gamma^0_{j0} = U^2\phi_{,i}\phi_{,j}

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

R^i{}_{0j0} = U^2\left(\phi_{,ij} + \phi_{,i}\,\phi_{,j}\right).

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

\phi'' = -(g/c^2)^2/U^2 = -(\phi')^2

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

U^2 \approx 1

This equation gives an approximation: it relates the quantities while allowing an approximation.