Numerical contraction for orbifold surfaces
نویسندگان
چکیده
We study singularities and Artin's contraction theorem for orbifold surfaces. Our main result has a consequence which is in the direction of birational Minimal Model Program b-terminal For example, we ascertain nature extremal contractions such $b$-terminal pairs.
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ژورنال
عنوان ژورنال: Bulletin of Institute of Mathematics, Academia sinica
سال: 2021
ISSN: ['2304-7909', '2304-7895']
DOI: https://doi.org/10.21915/bimas.2021303