Commutative Group Schemes by F Oort

Commutative Group Schemes by F Oort

We restrict ourselves to two aspects of the field of group schemes, in which the results are fairly complete: commutative algebraic group schemes over an algebraically closed field (of characteristic different from zero), and a duality theory concern- ing abelian schemes over a locally noetherian prescheme. The prelim- inaries for these considerations are brought together in chapter I. SERE described properties of the category of commutative quasi-algebraic groups by introducing pro-algebraic groups. In char8teristic zero the situation is clear. In characteristic different from zero information on finite group schemee is needed in order to handle group schemes; this information can be found in work of GABRIEL. In the second chapter these ideas of SERE and GABRIEL are put together. Also extension groups of elementary group schemes are determined. A suggestion in a paper by MANIN gave crystallization to a fee11ng of symmetry concerning subgroups of abelian varieties. In the third chapter we prove that the dual of an abelian scheme and the linear dual of a finite subgroup scheme are related in a very natural way. Afterwards we became aware that a special case of this theorem was already known by CARTIER and BARSOTI. Applications of this duality theorem are: the classical duality theorem (duality hy- pothesis, proved by CARTIER and by NISHI); calculation of Ext( a, A), where A is an abelian variety (result conjectured by SERE); a proof of the symmetry condition (due to MANIN) concerning the isogeny type of a formal group attached to an abelian variety.

SKU	Unavailable
ISBN 13	9783540035985
ISBN 10	3540035982
Title	Commutative Group Schemes
Author	F Oort
Series	Lecture Notes In Mathematics
Condition	Unavailable
Binding Type	Paperback
Publisher	Springer
Year published	1966-01-01
Number of pages	136
Cover note	Book picture is for illustrative purposes only, actual binding, cover or edition may vary.