The paper exhibits an invariant called the characteristic for generic points on plane linear 3-webs such that a diffeomorphism preserving it between two webs is locally a homography.
Blaschke, Uber die Tangenten einer ebenen Kurve funfter Klasse
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2019 1verdicts
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A step to Gronwall's conjecture
The paper exhibits an invariant called the characteristic for generic points on plane linear 3-webs such that a diffeomorphism preserving it between two webs is locally a homography.