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Affine bundle : ウィキペディア英語版
Affine bundle
In mathematics, an affine bundle is a fiber bundle whose typical fiber, fibers, trivialization morphisms and transition functions are affine.〔. (page 60)〕
==Formal definition==
Let \overline\pi:\overline Y\to X be a vector bundle with a typical fiber a vector space \overline F. An affine bundle modelled on a vector bundle \overline\pi:\overline Y\to X is a fiber bundle \pi:Y\to X whose typical fiber F is an affine space modelled on \overline F so that the following conditions hold:
(i) All the fiber Y_x of Y are affine spaces modelled over the corresponding fibers \overline Y_x of a vector bundle \overline Y.
(ii) There is an affine bundle atlas of Y\to X whose local trivializations morphisms and transition functions are affine isomorphisms.
Dealing with affine bundles, one uses only affine bundle coordinates (x^\mu,y^i) possessing affine transition functions
: y'^i= A^i_j(x^\nu)y^j + b^i(x^\nu).
There are the bundle morphisms
: Y\times_X\overline Y\longrightarrow Y,\qquad (y^i, \overline y^i)\longmapsto y^i +\overline y^i,
:Y\times_X Y\longrightarrow \overline Y,\qquad (y^i, y'^i)\longmapsto y^i - y'^i,
where (\overline y^i) are linear bundle coordinates on a vector bundle \overline Y, possessing linear transition functions \overline y'^i= A^i_j(x^\nu)\overline y^j .

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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