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Non-Hausdorff Manifolds via Adjunction Spaces

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arxiv 2011.12495 v3 pith:4LYGMTEK submitted 2020-11-25 math.GN

classification math.GN
keywords hausdorffadjunctionboundariesmanifoldsnon-hausdorffgluinghomeomorphicregions
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In this paper we will introduce and develop a theory of adjunction spaces which allows the construction of non-Hausdorff topological manifolds from standard Hausdorff ones. This is done by gluing Hausdorff manifolds along homeomorphic open submanifolds whilst leaving the boundaries of these regions unidentified. In the case that these gluing regions have homeomorphic boundaries, it is shown that Hausdorff violation occurs precisely at these boundaries. We then use this adjunction formalism to provide a partial characterisation of the maximal Hausdorff submanifolds that a given non-Hausdorff manifold may admit.

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  1. Quantum mechanics on the line with two origins

    quant-ph 2026-07 accept novelty 6.0 of 10

    On the non-Hausdorff line with two origins, scalar quantum mechanics is identical to the real line, while the nontrivial spinor line forces every continuous section to vanish at both origins and makes the first-order ...

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