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Complex geodesic : ウィキペディア英語版
Complex geodesic
In mathematics, a complex geodesic is a generalization of the notion of geodesic to complex spaces.
==Definition==
Let (''X'', || ||) be a complex Banach space and let ''B'' be the open unit ball in ''X''. Let Δ denote the open unit disc in the complex plane C, thought of as the Poincaré disc model for 2-dimensional real/1-dimensional complex hyperbolic geometry. Let the Poincaré metric ''ρ'' on Δ be given by
:\rho (a, b) = \tanh^ \frac
and denote the corresponding Carathéodory metric on ''B'' by ''d''. Then a holomorphic function ''f'' : Δ → ''B'' is said to be a complex geodesic if
:d(f(w), f(z)) = \rho (w, z) \,
for all points ''w'' and ''z'' in Δ.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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