Results 11 to 20 of about 683 (232)

Today’s menu: Geometry and resolution of singular algebraic surfaces [PDF]

Bulletin of the American Mathematical Society, 2010
The courses are Triviality, Tangency, Transversality, Symmetry, Simplicity, Singularity. These characteristic local plates serve as our invitation to algebraic surfaces and their resolution. Please take a seat.
Hauser, Herwig, Faber, Eleonore
openaire   +3 more sources

Kinematic Comparisons of Hybrid Mechanisms for Bone Surgery: 3-PRP-3-RPS and 3-RPS-3-PRP

Machines, 2022
This paper proposes an approach to derive the Jacobian matrix of a hybrid mechanism by applying a velocity operator to the transformation matrix. This Jacobian matrix is capable of deducing hybrid singularities, which cannot be identified by using the ...
Christopher Reinaldo, Sinh Nguyen Phu, Terence Essomba, Latifah Nurahmi   +3 more
doaj   +1 more source

A worldsheet approach to 𝒩 = 1 heterotic flux backgrounds

Journal of High Energy Physics, 2023
Heterotic backgrounds with torsion preserving minimal supersymmetry in four dimensions can be obtained as orbifolds of principal T 2 bundles over K3. We consider a worldsheet description of these backgrounds as gauged linear sigma-models (GLSMs) with (0,
Dan Israël, Yann Proto
doaj   +1 more source

Worldline formalism for a confined scalar field

Journal of High Energy Physics, 2019
The worldline formalism is a useful scheme in quantum field theory which has also become a powerful tool for numerical computations. The key ingredient in this formalism is the first quantization of an auxiliary point-particle whose transition amplitudes
Olindo Corradini, James P. Edwards, Idrish Huet, Lucas Manzo, Pablo Pisani   +4 more
doaj   +1 more source

Chern-Simons: Fano and Calabi-Yau

Advances in High Energy Physics, 2011
We present the complete classification of smooth toric Fano threefolds, known to the algebraic geometry literature, and perform some preliminary analyses in the context of brane tilings and Chern-Simons theory on M2-branes probing Calabi-Yau fourfold ...
Amihay Hanany, Yang-Hui He
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

Singularities of eight- and nine-particle amplitudes from cluster algebras and tropical geometry [PDF]

Journal of High Energy Physics, 2021
Abstract We further exploit the relation between tropical Grassmannians and Gr(4, n) cluster algebras in order to make and refine predictions for the singularities of scattering amplitudes in planar $$ \mathcal{N} $$ N = 4 super Yang-Mills theory at higher multiplicity n ≥ 8.
Henke, N., Papathanasiou, G.
openaire   +6 more sources

Finitely curved orbits of complex polynomial vector fields

Anais da Academia Brasileira de Ciências, 2007
This note is about the geometry of holomorphic foliations. Let X be a polynomial vector field with isolated singularities on C². We announce some results regarding two problems: 1.
Albetã C. Mafra
doaj   +1 more source

Algorithms in Singular [PDF]

Computer Science Journal of Moldova, 1996
Some algorithms for singularity theory and algebraic geometry The use of Grobner basis computations for treating systems of polynomial equations has become an important tool in many areas.
Hans Schonemann
doaj  

Hexapods with Plane-Symmetric Self-Motions

Robotics, 2018
A hexapod is a parallel manipulator where the platform is linked with the base by six legs, which are anchored via spherical joints. In general, such a mechanical device is rigid for fixed leg lengths, but, under particular conditions, it can perform a ...
Georg Nawratil
doaj   +1 more source