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Comodule : ウィキペディア英語版
Comodule
In mathematics, a comodule or corepresentation is a concept dual to a module. The definition of a comodule over a coalgebra is formed by dualizing the definition of a module over an associative algebra.
==Formal definition==
Let ''K'' be a field, and ''C'' be a coalgebra over ''K''. A (right) comodule over ''C'' is a ''K''-vector space ''M'' together with a linear map
:\rho\colon M \to M \otimes C
such that
# (\mathrm \otimes \Delta) \circ \rho = (\rho \otimes \mathrm) \circ \rho
# (\mathrm \otimes \varepsilon) \circ \rho = \mathrm,
where Δ is the comultiplication for ''C'', and ε is the counit.
Note that in the second rule we have identified M \otimes K with M\,.

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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