On boundedness of families of torsion free sheaves

On boundedness of families of torsion free sheaves
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论无扭滑轮族的有界性

DOI:
10.1215/kjm/1250521908
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发表时间:
1981
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通讯作者:
M. Maruyama
M. Maruyama
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文献类型:
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作者:
M. Maruyama

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定理3.13)。L和S是一个新的方案,X是一个射影的S-雪莱和S在向量S有一个f 0,(1)。设X/S的矩阵为n维空间,则当X/S的矩阵上的函数类为S时,等价条件为:(I)g有界.(Ii)在本文中,L 2 c(L(M))i a,(m+n-i)的L例如,0 n-i的系数a是b o n d e d,a是b o n d e d,a是B o n n w.(Iii)当L在Erg上运行时,d(c,(L),0,(1))是bo n d,d(c,(L),C),(1)是有界的。
T h eo rem (18 ] Theorem 3. 13 ). L et S be a noe therian schem e and X a projective S -sch em e w ith S am p le in v e rt ib le s h e a f 0 ,( 1 ) . Suppose th at the g e o m e tric f ib re s o f X / S are in te g ral and of dimension n. Then, f o r a f a m i ly g o f the classes o f in v e rtib le sh e av e s on the f ib res o f X / S , the f o llo w in g conditions are equiv alent: (i) g is bounded. (ii) In th e H ilb e rt p o ly n om ia l 2 c ( L ( m ) ) i a , ( m + n — i ) of L e g ., 0 n— i the coe fficient a, is b o u n d e d and a, is bo u n ded b e lo w . (iii) W henev er L runs ov er g , the d e g re e d (c ,(L ) , 0 ,(1 ) ) is b o u n d e d and d (c ,(L ) , C ) ,(1 ) ) is bounded be low .