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URLﾘﾝｸ(www.math.nagoya-u.ac.jp)
WHAT IS LOG TERMINAL ?
2004/4/23
OSAMU FUJINO
Abstract. In this paper, we explain the subtleties of various
kinds of log terminal singularities. We focus on the notion of
divisorial log terminal singularities, which seems to be the most
useful one. We explain Szab´o’s resolution lemma, the notion of
log resolution, adjunction formula for divisorial log terminal pairs,
and so on. We also collect miscellaneous results and examples on
singularities of pairs in the log MMP that help us understand log
terminal singularities.
Contents
1. What is log terminal? 1
2. Preliminaries on Q-divisors 3
3. Singularities of pairs 5
4. Divisorial log terminal 6
5. Resolution Lemma 6
6. Whitney umbrella 8
7. What is a log resolution? 10
8. Examples 12
9. Adjunction for dlt pairs 14
10. Miscellaneous comments 15
References 16
(引用終り)
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