A syzygy-based analysis claims spherical collapse can reach a singularity only for dust, isotropic, or negative-pressure fluids, but the derivation reduces to zero for radial heat flux and the 'iff' is unsupported.
Hilbert, Nachr
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On the Polynomial Degeneracy of Ricci Invariants and Spacetime Singularity
A syzygy-based analysis claims spherical collapse can reach a singularity only for dust, isotropic, or negative-pressure fluids, but the derivation reduces to zero for radial heat flux and the 'iff' is unsupported.