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In this paper we survey some finiteness results of the deformation classes of hyperk\"ahler Lagrangian fibrations, and we prove finiteness for stable Lagrangian fibrations with a given discriminant divisor.

Algebraic Geometry · Mathematics 2024-03-12 Ljudmila Kamenova

We introduce the notion of a simple fibration in $(1,2)$-surfaces. That is, a hypersurface inside a certain weighted projective space bundle over a curve such that the general fibre is a minimal surface of general type with $p_g=2$ and…

Algebraic Geometry · Mathematics 2023-05-05 Stephen Coughlan , Roberto Pignatelli

We verify that the Albanese fibration of the Cartwright-Steger surface is stable, answering a problem left open in [CKY].

Algebraic Geometry · Mathematics 2020-01-08 Vincent Koziarz , Sai-Kee Yeung

For Fano fibrations with $\epsilon$-lc singularities of a fixed dimension, we show the existence of bounded relative-global complements. If the base of the fibration is of dimension one, we even show the existence of bounded relative-global…

Algebraic Geometry · Mathematics 2024-02-20 Sung Rak Choi , Chuyu Zhou

Singular fibrations generalize achiral Lefschetz fibrations of 4-manifolds over surfaces while sharing some of their properties. For instance, relatively minimal singular fibrations are determined by their monodromy. We explain how to…

Geometric Topology · Mathematics 2024-04-24 Louis Funar

The theory of classical types of curves in normed planes is not strongly developed. In particular, the knowledge on existing concepts of curvatures of planar curves is widespread and not systematized in the literature. Giving a…

Differential Geometry · Mathematics 2017-02-07 Vitor Balestro , Horst Martini , Emad Shonoda

We prove finiteness of hyperkaehler Lagrangian fibrations in any fixed dimension with fixed Fujiki constant and discriminant of the Beauville-Bogomolov-Fujiki lattice, up to deformation. We also prove finiteness of hyperk\"ahler Lagrangian…

Algebraic Geometry · Mathematics 2016-06-08 Ljudmila Kamenova

The Grothendieck construction establishes an equivalence between fibrations, a.k.a. fibred categories, and indexed categories, and is one of the fundamental results of category theory. Cockett and Cruttwell introduced the notion of…

Category Theory · Mathematics 2025-07-30 Marcello Lanfranchi

In this paper we establish existence results for the Fractional Nirenberg Equation via the flatness hypothesis. We have been able to include the Morse functions in our study. This extends the previous results obtained bY Yan Yan Li and…

Analysis of PDEs · Mathematics 2016-10-12 W. Abdelhedi , H. Chtioui , H. Hajaiej

We classify exterior fibrations in the exterior homotopy category. As a result we also classify proper fibrations between CW-complexes.

Algebraic Topology · Mathematics 2019-06-05 Jose Manuel García-Calcines , Pedro Ruymán García-Díaz , Aniceto Murillo

This is not in any way meant to be a complete survey on positive curvature. Rather it is a short essay on the fascinating changes in the landscape surrounding positive curvature. In particular, details and many results and references are…

Differential Geometry · Mathematics 2009-02-26 Karsten Grove

A contact foliation is a foliation endowed with a leafwise contact structure. In this remark we explain a turbulisation procedure that allows us to prove that tightness is not a homotopy invariant property for contact foliations.

Symplectic Geometry · Mathematics 2017-09-13 Álvaro del Pino

We introduce and study a new notion of stability for varieties fibered over curves, motivated by Koll\'ar's stability for homogeneous polynomials with integral coefficients. We develop tools to study geometric properties of stable…

Algebraic Geometry · Mathematics 2021-08-17 Hamid Abban , Maksym Fedorchuk , Igor Krylov

Simple constructions are given for finite semifields that include as special cases both old semifields and recently constructed semifields.

Combinatorics · Mathematics 2012-01-04 Juergen Bierbrauer , William M. Kantor

In this paper we improve and extend some best proximity point results concerning the so-called proximal contractions. Specifically, compactness assumptions under the sets A and B are removed to consider completeness conditions instead.

Functional Analysis · Mathematics 2012-07-19 Aurora Fernández-León

We introduce the notion of Karamata regular operators, which is a notion of regularity that is suitable for obtaining concrete convergence rates for common fixed point problems. This provides a broad framework that includes, but goes…

Optimization and Control · Mathematics 2026-03-17 Tianxiang Liu , Bruno F. Lourenço

We address a problem posed in [1] by demonstrating through an example that, in the absence of separability, the property of sequential cone compactness does not generally imply cone compactness.

Functional Analysis · Mathematics 2025-01-10 Marius Durea , Elena-Andreea Florea

Finitely many hypersurfaces are removed from unordered configuration spaces of $n$ points in $\mathbb{C}$ to obtain a fibration over unordered configuration spaces of $n-1$ complex points. Fundamental groups of these restricted…

Geometric Topology · Mathematics 2024-09-05 Barbu Rudolf Berceanu

An elementary theory of strict $\infty $-categories with application to concrete duality is given. All known famous dualities (Gelfand-Naimark, Pontryagin, Stone, etc.) are so-called natural. A criterion of existence of such a duality for…

Category Theory · Mathematics 2008-07-29 G. V. Kondratiev

We revisit the abstract framework underlying the fibration method for producing rational points on the total space of fibrations over the projective line. By fine-tuning its dependence on external arithmetic conjectures, we render the…

Number Theory · Mathematics 2023-02-01 Yonatan Harpaz , Dasheng Wei , Olivier Wittenberg