The gauge-theoretic underdetermination of tetrads by the metric is a formal artifact, not a physical indeterminacy, since all tetrad choices yield identical observable predictions.
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(as used in philosophy of physics and metaphysics)
A situation where nature itself is genuinely ambiguous or undefined—where reality truly doesn't have a single answer, not just our description of it.
tetrad(General relativistic formulation of spinor fields)
A local frame field — a set of four orthonormal basis vectors defined at each point of spacetime — used to connect the curved spacetime manifold to the flat tangent space in which spinors are defined.
underdetermination(Philosophy of science; here applied (erroneously by some) to Gold's language learnability results)
The epistemic situation in which a finite body of evidence is insufficient to uniquely determine the correct theory among competing alternatives