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In differential geometry, a Lie algebra-valued form is a differential form with values in a Lie algebra. Such forms have important applications in the theory of connections on a principal bundle as well as in the theory of Cartan connections. == Wedge product == Since every Lie algebra has a bilinear Lie bracket operation, the wedge product of two Lie algebra-valued forms can be composed with the bracket operation to obtain another Lie algebra-valued form. This operation, denoted by , is given by: for -valued ''p''-form and -valued ''q''-form : where ''v''''i'''s are tangent vectors. The notation is meant to indicate both operations involved. For example, if and are Lie algebra-valued one forms, then one has : The operation can also be defined as the bilinear operation on satisfying : for all and . Some authors have used the notation instead of . The notation , which resembles a commutator, is justified by the fact that if the Lie algebra is a matrix algebra then is nothing but the graded commutator of and , i. e. if and then : where are wedge products formed using the matrix multiplication on . 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「Lie algebra-valued differential form」の詳細全文を読む スポンサード リンク
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