Results 11 to 20 of about 16,254,462 (314)

The structure of Frobenius kernels for automorphism group schemes [PDF]

Algebra & Number Theory, 2021
We establish structure results for Frobenius kernels of automorphism group schemes for surfaces of general type in positive characteristics. It turns out that there are surprisingly few possibilities. This relies on properties of the famous Witt algebra,
Stefan Schroer, Nikolaos Tziolas
semanticscholar   +1 more source

Automorphism group schemes of bielliptic and quasi-bielliptic surfaces [PDF]

Épijournal de Géométrie Algébrique, 2022
Bielliptic and quasi-bielliptic surfaces form one of the four classes of minimal smooth projective surfaces of Kodaira dimension $0$. In this article, we determine the automorphism schemes of these surfaces over algebraically closed fields of arbitrary ...
Gebhard Martin
doaj   +1 more source

Digitization and traceability: main results of the Living Lab on the wood-energy supply chain in Italy

Forest@, 2021
Italy is the first importer of wood-energy biomass worldwide, with tons of timber illegally imported every year and significant negative socio-economic and environmental consequences.
Ciliberti S, Brunori A, Mariano E, Frascarelli A   +3 more
doaj   +1 more source

Finite Group Schemes of Essential Dimension One [PDF]

Documenta Mathematica, 2019
We prove that if a finite group scheme $G$ over a field $k$ has essential dimension one, then it embeds in $PGL_{2/k}$. We use this to give an explicit classification of all infinitesimal group schemes of essential dimension one over any field and a ...
N. Fakhruddin
semanticscholar   +1 more source

On the fundamental group schemes of certain quotient varieties [PDF]

Tohoku mathematical journal, 2018
In \cite{armstrong}, M. Armstrong proved a beautiful result describing fundamental groups of quotient spaces. In this paper we prove an analogue of Armstrong's theorem in the setting of $F$-divided \cite{dS07} and essentially finite \cite{Nori76 ...
I. Biswas, P. H. Hai, J. Santos
semanticscholar   +1 more source

Bivariate representation and conjugacy class zeta functions associated to unipotent group schemes, I: Arithmetic properties [PDF]

Journal of group theroy, 2018
This is the first of two papers in which we introduce and study two bivariate zeta functions associated to unipotent group schemes over rings of integers of number fields.
Paula Macedo Lins de Araujo
semanticscholar   +1 more source

Smooth affine group schemes over the dual numbers [PDF]

Épijournal de Géométrie Algébrique, 2019
We provide an equivalence between the category of affine, smooth group schemes over the ring of generalized dual numbers $k[I]$, and the category of extensions of the form $1 \to \text{Lie}(G, I) \to E \to G \to 1$ where G is an affine, smooth group ...
Matthieu ROMAGNY, Dajano Tossici
doaj   +1 more source

Congruences of parahoric group schemes [PDF]

Algebra & Number Theory, 2018
Let $F$ be a non-archimedean local field and let $T$ be a torus over $F$. With $\mathcal{T}^{NR}$ denoting the Neron-Raynaud model of $T$, a result of Chai and Yu asserts that the model $\mathcal{T}^{NR} \times_{\mathfrak{O}_F} \mathfrak{O}_F/\mathfrak{p}
R. Ganapathy
semanticscholar   +1 more source

lp-CMFD acceleration schemes in multi-energy group 2D Monte Carlo transport

Frontiers in Energy Research, 2022
The linear prolongation flux update scheme is extended to both regular CMFD acceleration, as well as partial CMFD acceleration in 2D multi energy group Monte Carlo k-eigenvalue neutron transport problems.
Y. R. Than, S. Xiao
doaj   +1 more source

Kummer surfaces associated with group schemes [PDF]

Manuscripta mathematica, 2019
We introduce Kummer surfaces X=Km(C×C)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt ...
S. Kondō, S. Schröer
semanticscholar   +1 more source