Download Categorical Framework for the Study of Singular Spaces by William Fulton PDF

By William Fulton

ISBN-10: 0821822438

ISBN-13: 9780821822432

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Of dratic p = (O',E') the one of the two f o l Z o w i n g Let (x,y,z) p. e(E)=2) of (X,E~P). 1) We s h a l l suppose is by given exist e(E')=l. 60,E,p) = I for (This = 1 for a s~rongly also follows is of the type (X',E'~',P') following 0-0, let wO ,E) be a d i r e c t i o n a l properties is = qua- satisfied = O. 1). Conversely, be a p . s . n . s . r . p , < e(E). blowing-up of one has n e c e s s a r i l y then us s u p p o s e e(E') Proof. 1)). s. a) v ~ ' , E ' , P ' ) the dim D i r easily 2 = e(E) Proposition.

3) Remark. 4) Let A s. thus Z o? p. 4) a weaker is is the p = (x,y,z) by x or always sense of type is "normalized" iff by x y . normalized, than 0-1. the but the converse corresponding concept 0-0. 6). 4). &~ ,E,p) E is And t h e is defined given invariant as i n by xy). 8). 5) Remark. 8) Definition. 1) the "main of the vertex". 7) -1/slope is only Remark. invariants rences, above property lowest us d e n o t e for first of the segment one v e r t e x , A(D,E,p) (see has o n l y a finite I I~ ).

Proof. passage Pt ~ If 6 (D,E,P ~)<- p~ i s given , there is t such by a change as ( 2 . 3 . 6 . 1 ) that with 6(D,E,Pt)< strict 6 (D,E,p~). inequality, The and t h u s we have a c o n t r a d i c t i o n . 8) Definition. 5) w i l l be c a l l e d a " p r e p a r a t i o n o f p". ( 2 . 3 . 9 ) C o r o l l a r y . There i s always a prepared s t r o n g l y normalized system o f r e g u l a r parameters (For s h o r t , we s h a l l weite p . s . n . s . r . p . ) . p, gives us t h e e x i s t e n c e strategy.

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Categorical Framework for the Study of Singular Spaces (Memoirs of the American Mathematical Society) by William Fulton


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