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Tate twist : ウィキペディア英語版
Tate twist

In number theory and algebraic geometry, the Tate twist,〔'The Tate Twist', in Lecture Notes in Mathematics', Vol 1604, 1995, Springer, Berlin p.98-102〕 named after John Tate, is an operation on Galois modules.
For example, if ''K'' is a field, ''GK'' is its absolute Galois group, and ρ : ''GK'' → AutQ''p''(''V'') is a representation of ''GK'' on a finite-dimensional vector space ''V'' over the field Q''p'' of ''p''-adic numbers, then the Tate twist of ''V'', denoted ''V''(1), is the representation on the tensor product ''V''⊗Q''p''(1), where Q''p''(1) is the ''p''-adic cyclotomic character (i.e. the Tate module of the group of roots of unity in the separable closure ''Ks'' of ''K''). More generally, if ''m'' is a positive integer, the ''m''th Tate twist of ''V'', denoted ''V''(''m''), is the tensor product of ''V'' with the ''m''-fold tensor product of Q''p''(1). Denoting by Q''p''(−1) the dual representation of Q''p''(1), the ''-m''th Tate twist of ''V'' can be defined as
:V\otimes\mathbf_p(-1)^.
==References==


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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