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## Main Question or Discussion Point

Is anyone interested in going through Hawking and Ellis' book by the title above and posting questions and insights? My interest is in singularities in higher dimensional spacetime, and whether there are other ways to achieve singularities (and their zoology) besides large enough mass. I am interested in 4 dimensional hypersurfaces of signature change in 5 or higher dimensional spacetime, where the normal to the surface is not timelike.

Thanks,

-Iuval

Thanks,

-Iuval