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We prove that for a flipping contraction from a Gorenstein terminal 4fold, the pull back of a general hyperplane section of the down-stair has only canonical singularities. Based on this fact and using Siu-Kawamata-Nakayama’s extension theorem [Si], [Kaw4], [Kaw5] and [Nak2], we prove the existence of the flip of such a flipping contraction. Furthermore we classify such flipping contractions an...

Rebecca T. Hahn, MD, FASE, Chair, Theodore Abraham, MD, FASE, Mark S. Adams, RDCS, FASE, Charles J. Bruce, MD, FASE, Kathryn E. Glas, MD, MBA, FASE, Roberto M. Lang, MD, FASE, Scott T. Reeves, MD, MBA, FASE, Jack S. Shanewise, MD, FASE, Samuel C. Siu, MD, FASE, William Stewart, MD, FASE, and Michael H. Picard, MD, FASE, New York, New York; Baltimore, Maryland; Boston,Massachusetts; Rochester, M...

Purpose: The Société Internationale d’Urologie (SIU) conducted a survey to determine whether the pandemic has harmed mental health of practicing urologists worldwide. Methods: Members Executive Board SIU designed self-selected consisting multiple-choice questions about safety and during COVID-19 pandemic. was disseminated by email members Results: A total 3448 from 109 countries responded surve...

National Center for Agricultural Utilization Research, USDA, Agricultural Research Service, 1815 North University Street, Peoria, IL 61604, USA E-mail: [email protected]; 2Biotechnology Division for Fuels and Chemicals, National Renewable Energy Laboratory, Golden, CO 80401, USA 3Eastern Regional Research Center, USDA, Agricultural Research Service, Wyndmoor, PA 19038, USA 4Department of Agr...

In the paper [SY80] it was shown that a Kähler manifold with strictly positive bisectional curvature was biholomorphic to CP. In this paper, we use the techniques developed by [SY80], to prove that a compact Kähler manifold with positive orthogonal bisectional curvature is biholomorphic to CP, a condition strictly weaker than positive bisectional curvature. This gives a direct elliptic proof of...

For low order jets, it is known how to construct meromorphic frames on the space of the so-called vertical k-jets J vert(X ) of the universal hypersurface X ⊂ P×P (n+1+d)! (n+1)! d! parametrizing all projective hypersurfaces X ⊂ P(C) of degree d. In 2004, for k = n, Siu announced that there exist two constants cn > 1 and cn > 1 such that the twisted tangent bundle: TJn vert(X) ⊗OPn+1 `

In a recent paper we introduced Parikh slender languages and series as a generalization of slender languages de ned and studied by Andra siu, Dassow, P aun and Salomaa. Results concerning Parikh slender series can be applied in ambiguity proofs of context-free languages. In this paper an algorithm is presented for deciding whether or not a given N-algebraic series is Parikh slender. Category: F...