منابع مشابه
Birational Rigidity and Q-factoriality of a Singular Double Quadric
We prove birational rigidity and calculate the group of birational automorphisms of a nodal Q-factorial double cover X of a smooth three-dimensional quadric branched over a quartic section. We also prove that X is Q-factorial provided that it has at most 11 singularities; moreover, we give an example of a non-Q-factorial variety of this type with 12 simple double singularities.
متن کاملRigidity of Differential Operators and Chern Numbers of Singular Varieties
A differential operator D commuting with an S-action is said to be rigid if the non-constant Fourier coefficients of kerD and coker D are the same. Somewhat surprisingly, the study of rigid differential operators turns out to be closely related to the problem of defining Chern numbers on singular varieties. This relationship comes into play when we make use of the rigidity properties of the com...
متن کاملGenuine versus Non-Genuine Atomic Multicast Protocols
In this paper, we study atomic multicast, a fundamental abstraction for building fault-tolerant systems. We suppose a system composed of data centers, or groups, that host many processes connected through high-end local links; a few groups exist, interconnected through high-latency communication links. In this context, a recent paper has shown that no multicast protocol can deliver messages add...
متن کاملGenuine Atomic Multicast
This paper addresses the problem of atomic multicasting messages in asynchronous systems with unreliable failure detection. First, we give a characterisation of the notion of algorithms tolerating unreliable failure detection. Second, we give a characterisation of the notion of genuine atomic multicast. This characterisation leads to a better understanding of the diierence between atomic multic...
متن کاملGradient bounds and rigidity results for singular , degenerate , anisotropic partial differential equations
We consider the Wulff-type energy functional
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Commentarii Mathematici Helvetici
سال: 2020
ISSN: 0010-2571
DOI: 10.4171/cmh/488