The empirical success of quantum electrodynamics vindicates London's 1927 reinterpretation of Weyl's gauge idea, not Weyl's original metrical theory, making the inference from interference experiments to Weyl's specific claim underdetermined.

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Empirical success(as used in philosophy of science): When a scientific theory makes accurate predictions and works well in real-world experiments, even if we're not sure if everything it claims is actually true.
Gauge theory / gauge idea(Weyl's original contribution that was later reinterpreted): A mathematical framework in physics that describes how forces work by allowing certain transformations without changing physical predictions.
Interference experiments(the experimental evidence being used to test theories): Scientific experiments that show how waves (like light) overlap and create patterns of brightness and darkness.
London (Fritz London)(the scientist whose version of the theory proved more successful): A 20th-century physicist who reinterpreted Weyl's gauge theory in a new way in 1927.

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Metrical theory(Weyl's specific original approach that London's version replaced)

In Weyl's original work, a theory that tried to explain gravity and electromagnetism by changing how we measure distances in space.

Quantum electrodynamics(the theory being discussed as successful)

A scientific theory that explains how light and electricity interact at the tiniest scales of atoms and particles.

Underdetermined (inference is underdetermined)(describing how the experimental evidence doesn't uniquely prove Weyl's specific original theory)

When the available evidence doesn't clearly point to just one conclusion—multiple different theories could fit the same observations.

Weyl (Hermann Weyl)(the scientist whose original idea is being evaluated)

A 20th-century mathematician and physicist who developed important ideas about symmetry and gauge theory in physics.

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