Results 21 to 30 of about 534 (81)

Equations of low-degree Projective Surfaces with three-divisible Sets of Cusps [PDF]

, 2004
Let Y be a surface with only finitely many singularities all of which are cusps. A set of cusps on Y is called three-divisible, if there is a cyclic global triple cover of Y branched precisely over these cusps.
Barth, Wolf P., Rams, Slawomir
core   +1 more source

Corrigendum to "Reduced Tangent Cones and Conductor at Multiplanar Isolated Singularities"

, 2019
We explicitly fix a mistake in a preliminary statement of our previous paper on the conductor at a multiplanar singularity. The correction is not immediate and, though the mistake does not affect correctness of the subsequent results, the wrong statement
De Paris, Alessandro, Orecchia, Ferruccio   +1 more
core   +1 more source

Stable degeneration of families of klt singularities with constant local volume

Forum of Mathematics, Sigma
For a klt singularity, C. Xu and Z. Zhuang [33] proved the associated graded algebra of a minimizing valuation of the normalized volume function is finitely generated, finishing the proof of the stable degeneration conjecture proposed by C. Li and C. Xu.
Zhiyuan Chen
doaj   +1 more source

Local Euler characteristics of $A_n$-singularities and their application to hyperbolicity [PDF]

Épijournal de Géométrie Algébrique
Wahl's local Euler characteristic measures the local contributions of a singularity to the usual Euler characteristic of a sheaf. Using tools from toric geometry, we study the local Euler characteristic of sheaves of symmetric differentials for isolated ...
Nils Bruin, Nathan Ilten, Zhe Xu
doaj   +1 more source

Two series of polyhedral fundamental domains for Lorentz bi-quotients [PDF]

, 2019
The main aim of this paper is to give two infinite series of examples of Lorentz space forms that can be obtained from Lorentz polyhedra by identification of faces.
Pratoussevitch, Anna, Turki, Nasser Bin
core   +2 more sources

Limits of nodal surfaces and applications

Forum of Mathematics, Sigma
Let $\mathcal {X}\to \mathbb {D}$ be a flat family of projective complex 3-folds over a disc $\mathbb {D}$ with smooth total space $\mathcal {X}$ and smooth general fibre $\mathcal {X}_t,$ and whose special fiber $\mathcal
Ciro Ciliberto, Concettina Galati
doaj   +1 more source

Optimal bound for singularities on Fano type fibrations of relative dimension one

Forum of Mathematics, Sigma
Let $\pi :X\rightarrow Z$ be a Fano type fibration with $\dim X-\dim Z=d$ and let $(X,B)$ be an $\epsilon $ -lc pair with $K_X+B\sim _{\mathbb {R}} 0/Z$ . The canonical bundle formula gives $(Z,B_Z+M_Z)$ where $
Bingyi Chen
doaj   +1 more source

Pathological MMP singularities as αp-quotients

Forum of Mathematics, Sigma
We construct pathological examples of MMP singularities in every positive characteristic using quotients by $\alpha _p$ -actions. In particular, we obtain non- $S_3$ terminal singularities, as well as locally stable (respectively stable ...
Quentin Posva
doaj   +1 more source

Validating the parental reflective functioning questionnaire ‐ infant version using a rasch model

Infant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 4, Page 445-458, July 2025.
Abstract Parental reflective functioning is the parent's ability to reflect on the psychological processes in their child and in themselves as a parent. Recently, an infant version of the Parental Reflective Functioning Questionnaire, PRFQ‐I, has been developed and validated using confirmatory factor analyses.
Anne Christine Stuart, Ida Egmose, Katrine Isabella Wendelboe, Johanne Smith‐Nielsen, Mette Skovgaard Væver   +4 more
wiley   +1 more source

Cusps and Codes

, 2004
We study a construction, which produces surfaces $Y \subset P_3$ with cusps. For example we obtain surfaces of degree six with 18, 24 or 27 three-divisible cusps.
Barth, Wolf P., Rams, Slawomir
core   +1 more source