Sharp higher-order Hardy-Rellich inequalities, stability estimates, and exact L2 remainder identities are established for radial Baouendi-Grushin operators, but the advertised critical-subcritical equivalence has an internal exponent mismatch.
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Extremizer Stability of Higher-order Hardy-Rellich inequalities for Baouendi--Grushin vector fields
Sharp higher-order Hardy-Rellich inequalities, stability estimates, and exact L2 remainder identities are established for radial Baouendi-Grushin operators, but the advertised critical-subcritical equivalence has an internal exponent mismatch.