Abstract
In what follows, surface will mean nonsingular projective surface. If other types of surfaces are to be considered, we will specify that explicitly; for example, we will say normal surfaces, affine surfaces, etc.
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Bibliographic References
The main references for this chapter are [Artl, Art2].
The method of proof of (3.12), (3.13), and (3.14) belongs to the author.
Some of the proofs (for example, those of (3.23), (3.24), and (3.25)) were inspired by [Lip].
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© 2001 Springer Science+Business Media New York
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Bădescu, L. (2001). Criteria of Contractability and Rational Singularities. In: Algebraic Surfaces. Universitext. Springer, New York, NY. https://doi.org/10.1007/978-1-4757-3512-3_3
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DOI: https://doi.org/10.1007/978-1-4757-3512-3_3
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4419-3149-8
Online ISBN: 978-1-4757-3512-3
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