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Preimage theorem : ウィキペディア英語版 | Preimage theorem In mathematics, particularly in differential topology, the preimage theorem is a variation of the implicit function theorem concerning the preimage of particular points in a manifold under the action of a smooth map.〔.〕〔.〕 ==Statement of Theorem==
''Definition.'' Let be a smooth map between manifolds. We say that a point is a ''regular value of f'' if for all the map is surjective. Here, and are the tangent spaces of X and Y at the points x and y. ''Theorem.'' Let be a smooth map, and let be a regular value of ''f''; then is a submanifold of X. If , then the codimension of is equal to the dimension of Y. Also, the tangent space of at is equal to .
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「Preimage theorem」の詳細全文を読む
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