Abstract

We investigate a flipping contraction g: XY from a 4-fold X with at worst isolated complete intersection singularities. If Y has an anti-bicanonical divisor (= bi-elephant) with only rational singularities, then g carries an inductive structure involving a chain of blow-ups (which we call La Torre Pendente), and in particular, the flip exists. This naturally contains Reid's "Pagoda" as an anticanonical divisor (= elephant) and its proper transforms.

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Additional Information

ISSN
1080-6377
Print ISSN
0002-9327
Pages
pp. 43-102
Launched on MUSE
1998-02-01
Open Access
No
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