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In mathematics, the Bockstein spectral sequence is a spectral sequence relating the homology with mod ''p'' coefficients and the homology reduced mod ''p''. It is named after Meyer Bockstein. == Definition == Let ''C'' be a chain complex of torsion-free abelian groups and ''p'' a prime number. Then we have the exact sequence: :. Taking integral homology ''H'', we get the exact couple of "doubly graded" abelian groups: :. where the grading goes: and the same for , , , . This gives the first page of the spectral sequence: we take with the differential and , we get: :. This tells the kernel and cokernel of . Expanding the exact couple into a long exact sequence, we get: for any ''r'', :. When , this is the same thing as the universal coefficient theorem for homology. Assume the abelian group is finitely generated; in particular, only finitely many cyclic modules of the form can appear as a direct summand of . Letting we thus see is isomorphic 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「Bockstein spectral sequence」の詳細全文を読む スポンサード リンク
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