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We study global log canonical thresholds of cubic surfaces with canonical singularities, and we prove the existence of a Kahler-Einstein metric on two singular cubic surfaces.

Algebraic Geometry · Mathematics 2007-06-20 Ivan Cheltsov

We introduce the notion of strongly asymptotically log del Pezzo flags, and classify such flags under the assumption that their zero-dimensional part lies in the boundary. We use this result to give a new and conceptual proof of the…

Algebraic Geometry · Mathematics 2024-11-20 Yanir A. Rubinstein

We prove the existence of Kahler-Einstein metrics on a nonsingular section of the Grassmannian $\mathrm{Gr}(2, 5)\subset\mathbb{P}^9$ by a linear subspace of codimension 3, and the Fermat hypersurface of degree 6 in $\mathbb{P}(1,1,1,2,3)$.…

Algebraic Geometry · Mathematics 2009-02-08 Ivan Cheltsov , Constantin Shramov

We characterise integral points of bounded log-anticanonical height on a quartic del Pezzo surface of singularity type $\mathbf{A}_3$ over imaginary quadratic fields with respect to its singularity and its lines. Furthermore, we count these…

Number Theory · Mathematics 2023-07-25 Judith Ortmann

Toric log del Pezzo surfaces correspond to convex lattice polygons containing the origin in their interior and having only primitive vertices. An upper bound on the volume and on the number of boundary lattice points of these polygons is…

Algebraic Geometry · Mathematics 2010-05-02 Alexander M. Kasprzyk , Maximilian Kreuzer , Benjamin Nill

For a smooth germ of algebraic variety $(X,0)$ and a hypersurface $(f=0)$ in $X$, with an isolated singularity at $0$, Teissier conjectured a lower bound for the Arnold exponent of $f$ in terms of the Arnold exponent of a hyperplane section…

Algebraic Geometry · Mathematics 2021-07-07 Eva Elduque , Mircea Mustata

We compute log canonical thresholds of reduced plane curves of degree $d$ at points of multiplicity $d-1$. As a consequence, we describe all possible values of log canonical threshold that are less than $2/(d-1)$ for reduced plane curves of…

Algebraic Geometry · Mathematics 2026-04-22 Erik Paemurru , Nivedita Viswanathan

We establish the minimal model theory for $\mathbb Q$-factorial log surfaces and log canonical surfaces in Fujiki's class $\mathcal C$.

Algebraic Geometry · Mathematics 2020-01-22 Osamu Fujino

We prove an asymptotic formula for the number of integral points of bounded log-anticanonical height on split smooth quintic del Pezzo surfaces over number fields, with respect to one of the lines as the boundary divisor.

Number Theory · Mathematics 2025-05-16 Christian Bernert , Ulrich Derenthal

We compute global log canonical thresholds of some smooth Fano threefolds.

Algebraic Geometry · Mathematics 2009-02-08 Ivan Cheltsov , Constantin Shramov

In this paper, we prove a formula of Grauert-Riemenschneider canonical sheaf and log canonical thresholds for a general residual intersection as well as an equality of minimal log discrepancies under a general link. We also prove an…

Algebraic Geometry · Mathematics 2018-01-12 Shihoko Ishii , Wenbo Niu

A normal projective non-Gorenstein log-terminal surface $S$ is called a log del Pezzo surface of index three if the three-times of the anti-canonical divisor $-3K_S$ is an ample Cartier divisor. We classify all of the log del Pezzo surfaces…

Algebraic Geometry · Mathematics 2014-01-08 Kento Fujita , Kazunori Yasutake

We prove several boundedness statements for geometrically integral normal del Pezzo surfaces $X$ over arbitrary fields. We give an explicit sharp bound on the irregularity if $X$ is canonical or regular. In particular, we show that wild…

Algebraic Geometry · Mathematics 2025-04-23 Fabio Bernasconi , Gebhard Martin

Recent advances have clarified theoretical learning accuracy in Bayesian inference, revealing that the asymptotic behavior of metrics such as generalization loss and free energy, assessing predictive accuracy, is dictated by a rational…

Statistics Theory · Mathematics 2024-08-26 Yuki Kurumadani

We introduce the notion of generalized MR log canonical surfaces and establish the minimal model theory for generalized MR log canonical surfaces in full generality.

Algebraic Geometry · Mathematics 2020-12-03 Osamu Fujino

We establish a link between the GIT stability of complete intersections of same degree hypersurfaces in the same ambient projective space, which can be parametrised as tuples in a Grassmanian scheme, and the log canonical thresholds of…

Algebraic Geometry · Mathematics 2022-12-26 Theodoros Stylianos Papazachariou

We prove Fujita-type basepoint-freeness for projective quasi-log canonical curves and surfaces.

Algebraic Geometry · Mathematics 2020-12-23 Osamu Fujino , Haidong Liu

We generalize the formula for the log canonical threshold(LCT) of plane curves over the complex numbers to arbitrary characteristics. Our proof relies purely on valuation theory, instead of on the theory of $D$-modules.

Algebraic Geometry · Mathematics 2026-02-03 Chih-Kuang Lee

It is shown that the log-canonical threshold of a curve with an isolated singularity is computed by the term ideal of the curve in a suitable system of local parameters at the singularity. The proof uses the Enriques diagram of the…

Algebraic Geometry · Mathematics 2007-07-06 Marian Aprodu , Daniel Naie

Motivated by homological mirror symmetry, this paper constructs explicit full exceptional collections for the canonical stacks associated with the series of log del Pezzo surfaces constructed by Johnson and Koll\'ar. These surfaces have…

Algebraic Geometry · Mathematics 2023-09-27 Giulia Gugiatti , Franco Rota