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group scheme
名詞
group scheme (複数形 group schemes)
- (category theory, scheme theory) A group object that is an object in a category of schemes; a scheme that has certain properties that generalise the concept of group.
- 1973, Jean A. Dieudonné, Introduction to the Theory of Formal Groups, Marcel Dekker, page 6,
It is instructive to give a few explicit examples of such[affine] group schemes: - 2013, Philippe Gille, Arturo Pianzola, Torsors, Reductive Group Schemes and Extended Affine Lie Algebras, American Mathematical Society, page 11,
We will tend to use boldface characters, such as G {\displaystyle \mathbf {G} } , for algebraic groups over k {\displaystyle k} , as also for group schemes over X {\displaystyle {\mathfrak {X}}} that are obtained from groups over k {\displaystyle k} . A quintessential example is G X = G × k X {\displaystyle \mathbf {G} _{\mathfrak {X}}=\mathbf {G} \times _{k}{\mathfrak {X}}} . For arbitrary group schemes, or more generally group functors, over X {\displaystyle {\mathfrak {X}}} we shall tend to use german characters, such as G {\displaystyle {\mathfrak {G}}} . - 2014, J. S. Milne, The Work of John Tate, Helge Holden, Ragni Piene (editors), The Abel Prize 2008-2012, Springer, page 303,
Every finite flat group scheme of order p {\displaystyle p} over S {\displaystyle S} is of the form G a , b L {\displaystyle G_{a,b}^{L}} for some triple ( L , a , b ) {\displaystyle (L,a,b)} , and G a , b L {\displaystyle G_{a,b}^{L}} is isomorphic to G a 1 , b 1 L 1 {\displaystyle G_{a_{1},b_{1}}^{L_{1}}} if and only if there exists an isomorphism from L {\displaystyle L} to L 1 {\displaystyle L_{1}} carrying a {\displaystyle a} to a 1 {\displaystyle a_{1}} and b {\displaystyle b} to b 1 {\displaystyle b_{1}} .
- 1973, Jean A. Dieudonné, Introduction to the Theory of Formal Groups, Marcel Dekker, page 6,
Further reading
- Group-scheme action on Wikipedia.
- Groupoid scheme on Wikipedia.
- Group scheme on Encyclopedia of Mathematics on Wikipedia.
- group scheme on nLab on Wikipedia.
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