The Gauss-Bonnet type theorem for future directed fronts in hyperbolic 3-space and de Sitter 3-space

HOKKAIDO MATHEMATICAL JOURNAL（2023）

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摘要

We give a Gauss-Bonnet type theorem for future directed fronts in hyperbolic 3-space and de Sitter 3-space. This theorem relates the lightlike geometry to the topology of these singular objects.

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关键词

fronts,de sitter,gauss-bonnet

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