Projective lines as groupoids with projection structure
classification
🧮 math.CT
keywords
fieldgroupoidprojectionprojectivestructureabstractlyconstructedconversely
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The coordinate projective line over a field is seen as a groupoid with a further `projection' structure. We investigate conversely to what extent such an, abstractly given, groupoid may be coordinatized by a suitable field constructed out of the geometry.
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