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Locally finite operator
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Locally finite operator : ウィキペディア英語版
Locally finite operator

In mathematics, a linear operator f: V\to V is called locally finite if the space V is the union of a family of finite-dimensional f-invariant subspaces.
In other words, there exists a family \ of linear subspaces of V, such that we have the following:
* \bigcup_ V_i=V
* (\forall i\in I) f()\subseteq V_i
* Each V_i is finite-dimensional.
==Examples==

* Every linear operator on a finite-dimensional space is trivially locally finite.
* Every diagonalizable (i.e. there exists a basis of V whose elements are all eigenvectors of f) linear operator is locally finite, because it is the union of subspaces spanned by finitely many eigenvectors of f.


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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