By Hiroaki Hikikata
ISBN-10: 0123480329
ISBN-13: 9780123480323
Read Online or Download Algebraic Geometry and Commutative Algebra. In Honor of Masayoshi Nagata, Volume 2 PDF
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Additional info for Algebraic Geometry and Commutative Algebra. In Honor of Masayoshi Nagata, Volume 2
Example text
Furthermore the cycle in the ( C B ) is a rational cycle and the trees in the ( C B ) consist of nonsingular rational curves. Curves other than in the ( C B ) are also non-singular rational curves. Proof. 5. §2. Let S be a surface of class V I I 0 which has curves. We assume that the canonical bundle Κ of S has a meromorphic section with poles and no zeros along the curves, namely Κ is written as Ν K = J2(-ai)Cl (JV>1), where C^s are distinct curves and a;'s are positive integers. 1. Let S be as above.
1)). Hence 1 = ht Ρ > ht p 7 + 1 for any 7 G Γ ( 7 2 ) . Therefore, ht p* = 0. 6) is proved and this completes the proof of Rotthaus' Hilfssatz. Next proposition shows that, in some practical cases, a bounded prime ideal sequence automatically becomes good. 18. Let A be a noetherian ring and m G M a x ( A ) . Fixing an element x G A and a minimal prime ideal pj^ of 6p(A^n) ( = Spec(A^) Kr(A*m)), let p; = p*m Π A; for 7 e r ( m ) ( = r ( { m } ) ) . 3) A/xA is a nagata Ρ-ring. Then, if the prime ideal sequence { p 7 } 7 e r ( m ) is bounded, it is also good.
Q*na(B n)$ m = q m(B*X Π · · · Π q*nt{B*n)î. *) such that ht q^ < ho (1 < i < î ) , unless c*n{B*)*. = {B*n)$. nor q*nl = · · · = q*nt = q*. Therefore, by the minimality assumption on ht q*, ? Π Β = q£i Π · · · Π q*t Π Β φ (0). 2). 3 (Continued). We know that Ρ ( = being regular) satisfies the conditions P i , Ρ π , Ρ γ , and that Local Lifting Theorem holds for P . 4. o7 f 7 £ ( ο ) · Then A(x) is a finite set. Proof. If r a d ( £ 0) = Pi Π · · · η Pr with P i , . . , Pr G Spec(J? =i ^* } · Then, it is easy to see Δ 0 ( χ ) is a finite set (cf.
Algebraic Geometry and Commutative Algebra. In Honor of Masayoshi Nagata, Volume 2 by Hiroaki Hikikata
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