For a physical singularity I think it is sufficient that any one scalar quantity blows up,(adsbygoogle = window.adsbygoogle || []).push({});

Why is it not a necessary condition that all blow up?

For a curvature singularity am I correct in thinking that it is a sufficient condition to find a coordinate system in which the metric coefficient no longer blows up at that point?

Is the only necessary condition for a curvature singularity to check that all non scalar quantites are not infinite?

Thanks.

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# Necessary / sufficient conditions for physical curvature singularity

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