A Schur complement proof shows that gauge-fixing admissibility in constrained systems is independent of the second-class sector, linking Hamiltonian and Lagrangian completeness criteria.
The principle of symmetric criticality
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A note on complete gauge-fixing and the constraint algebra
A Schur complement proof shows that gauge-fixing admissibility in constrained systems is independent of the second-class sector, linking Hamiltonian and Lagrangian completeness criteria.