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arxiv: 1003.2095 · v1 · submitted 2010-03-10 · 🧮 math.AG

Geometric algebra of projective lines

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keywords fieldgroupoidprojectivealgebraarrowscarriescertaincorrespondence
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The projective line over a field carries structure of a groupoid with a certain correspondence between objects and arrows. We discuss to what extent the field can be reconstructed from the groupoid.

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