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This is an in-mail from TYUST.
本期开始加开窗口,推出科学网特色博主,有用链接等。
心中有块石头...
(接上回*)定理1.6证明部分(第五段)。
By Proposition 5.9, there is a Q-divisor Λ ≥ 0 such that nΛ is integral, mA-Λ is ample, (X, Λ) is lc near x, and T is a lc place of (X, Λ).
评论:到这一步,终于完全靠到命题5.9上了。之前的段落都是为这一步做准备(但其中的探索过程大概是看不到的)。
Replacing A, C, L, s with 2mA, 2mC, 2mL, s/(2m), respectively, and replacing r accordingly, we can assume A - B - sL and A - Λ are ample.
评论:从下一步看,这一步是为应用命题5.7做准备。
Applingy Proposition 5.7 to (X, B + sL), there is a natural number q depending only on d, r, n, eps' such that if vn: U-->X is a resolution so that T is a divisor on U, then muTvu*L<=q. Pick such a resolution.
评论:应用了命题5.7,得到q的不等式(从下一段看很关键)。跳点:命题5.7。
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小结:第五段完毕。
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进入第六段(最后一段)。
Finally since
a(T, X, B)>=eps>eps' = a(T, X, B + sL),
we have muTvu*sL >= eps - eps' which implies s >= (eps - eps')/q, hence s is bounded from below as required.
评论:这一步该不难(尽管暂时看不清)。
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小结:第六段完毕(定理1.6证明完毕)。下一步,转到命题5.7的叙述。计划:尝试把整个证明做成卡片...
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从这部分的证明看,代数几何可能并不难,但是非常琐碎。这里头的(探索)方法尚不清楚。
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