A commutativity theorem of partial differential operators |
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| Authors: | Gui-zhang Tu |
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| Institution: | (1) Department of Mathematics, University of Lancaster, LA1 4YL Lancaster;(2) Department of Mathematics, University of York, YO1 5DD York, UK |
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| Abstract: | We describe a modification of Schmidt's b-boundary for a space-time, using a projective limit construction. The resulting boundary provides endopoints for all incomplete inextensible curves that are not totally or partially trapped, and every boundary point is an endpoint of such a curve. Boundary points are always Hausdorff separated from interior points, and the construction gives separate past and future singularities in thek=+1,  =0, Friedmann cosmology. |
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