Hermitian Form Metric
In 1905 Study wrote "Kürzeste Weg im complexen Gebiet" (Shortest path in complex domains) for Mathematische Annalen (60:321–378). Some of its contents were anticipated by Guido Fubini a year before. The distance Study refers to is a Hermitian form on complex projective space. Since then this metric has been called the Fubini–Study metric. Study was careful in 1905 to distinguish the hyperbolic and elliptic cases in Hermitian geometry.
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