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Line field
In mathematics, a line field on a manifold is a formation of a line being tangent to a manifold at each point, i.e. a section of the line bundle over the manifold. Line fields are of particular interest in the study of complex dynamical systems, where it is conventional to modify the definition slightly. ==Definitions==
In general, let ''M'' be a manifold. A line field on ''M'' is a function ''μ'' that assigns to each point ''p'' of ''M'' a line ''μ''(''p'') through the origin in the tangent space T''p''(''M''). Equivalently, one may say that ''μ''(''p'') is an element of the projective tangent space PT''p''(''M''), or that ''μ'' is a section of the projective tangent bundle PT(''M''). In the study of complex dynamical systems, the manifold ''M'' is taken to be a Hersee surface. A line field on a subset ''A'' of ''M'' (where ''A'' is required to have positive two-dimensional Lebesgue measure) is a line field on ''A'' in the general sense above that is defined almost everywhere in ''A'' and is also a measurable function.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Line field」の詳細全文を読む
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