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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1922 Dec;8(12):347–350. doi: 10.1073/pnas.8.12.347

Projective and Affine Geometry of Paths

O Veblen 1
PMCID: PMC1085184  PMID: 16576651

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