Hilbert and Klein explicitly showed in 1917 that general covariance produces identities that trivialize energy conservation, a point Noether's theorem formalizes rather than resolves.
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Equations that are always true no matter what values you plug in, like '2+2=4' or 'x+0=x'; in physics, identities can make certain laws appear meaningless or automatically satisfied.
Klein(the statement refers to Klein's specific philosophical position)
Peter Klein is a contemporary philosopher who developed a theory about how we know things are true and what makes beliefs justified.
Noether's theorem(as a key theorem in physics and mathematics)
A mathematical proof by Emmy Noether (1918) showing that every symmetry in physics corresponds to a conservation law—for example, the fact that laws don't change over time means energy is conserved.
Trivialize(as used to describe what general covariance does to energy conservation)
To make something seem unimportant or automatically true in a way that strips away its real meaning—here, general covariance creates mathematical identities that make energy conservation look like it's always automatically satisfied rather than a meaningful constraint.