Results 41 to 50 of about 511 (63)

Discrepancies of non-$\Q$-Gorenstein varieties

open access: yes, 2011
We give an example of a non $\Q$-Gorenstein variety which is canonical but not klt, and whose canonical divisor has an irrational valuation. We also give an example of an irrational jumping number and we prove that there are no accumulation points for ...
Urbinati, Stefano
core   +1 more source

A McKay Correspondence in Positive Characteristic

open access: yesForum of Mathematics, Sigma
We establish a McKay correspondence for finite and linearly reductive subgroup schemes of ${\mathbf {SL}}_2$ in positive characteristic.
Christian Liedtke
doaj   +1 more source

Uniform stable radius, L\^e numbers and topological triviality for line singularities

open access: yes, 2017
Let $\{f_t\}$ be a family of complex polynomial functions with line singularities. We show that if $\{f_t\}$ has a uniform stable radius (for the corresponding Milnor fibrations), then the L\^e numbers of the functions $f_t$ are independent of $t$ for ...
Eyral, Christophe
core   +1 more source

Fundamental Domains in Lorentzian Geometry [PDF]

open access: yes, 2004
We consider discrete subgroups Gamma of the simply connected Lie group SU~(1,1), the universal cover of SU(1,1), of finite level, i.e. the subgroup intersects the centre of SU~(1,1) in a subgroup of finite index, this index is called the level of the ...
Pratoussevitch, Anna
core   +4 more sources

Testing Lipschitz non normally embedded complex spaces

open access: yes, 2018
We introduce a sectional criterion for testing if complex analytic germs $(X,0) \subset (\bC^n, 0)$ are Lipschitz non normally embedded.Comment: title changed; more introduction.
Denkowski, Maciej, Tibar, Mihai
core  

Quasi-log canonical pairs are Du Bois

open access: yes, 2019
We prove that every quasi-log canonical pair has only Du Bois singularities. Note that our arguments are free from the minimal model program.Comment: 6 pages, v2: very minor modifications, v3: add some explanations in the proof of Theorem 1.1.
Fujino, Osamu, Liu, Haidong
core  

Gap conjecture for 3-dimensional canonical thresholds

open access: yes, 2008
We prove that the interval $(5/6, 1)$ contains no 3-dimensional canonical thresholds.Comment: 8 pages, latex, one reference is ...
Prokhorov, Yuri
core  

Categorical Aspects of the Double Structure of a Module

open access: yes, 2017
In this work we develop some categorical aspects of the double structure of a ...
da Silva, Thiago F.
core  

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