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In this paper we develop in detail the geometric constructions that lead to many uniqueness results for the determination of polyhedral sets, typically scatterers, by a finite minimal number of measurements. We highlight how unique…

Analysis of PDEs · Mathematics 2023-10-10 Luca Rondi

All components of complements of discriminant varieties of simple real function singularities are explicitly listed. New invariants of such components (for not necessarily simple singularities) are introduced. A combinatorial algorithm…

Algebraic Geometry · Mathematics 2022-04-25 V. A. Vassiliev

A general method for solving linear differential equations of arbitrary order, is used to arrive at new representations for the solutions of the known differential equations, both without and with a source term. A new quasi-solvable…

Mathematical Physics · Physics 2008-04-24 N. Gurappa , Pankaj K. Jha , Prasanta K. Panigrahi

A general expression for a relative invariant of a linear ordinary differential equations is given in terms of the fundamental semi-invariant and an absolute invariant. This result is used to established a number of properties of relative…

Analysis of PDEs · Mathematics 2008-06-30 J. C. Ndogmo

This paper is devoted to give all the technical constructions and definitions that will lead to the construction of an algorithm of resolution of singularities for binomial ideals. We construct a resolution function that will provide a…

Algebraic Geometry · Mathematics 2010-09-06 Rocio Blanco

Given a real algebraic curve, embedded in projective space, we study the computational problem of deciding whether there exists a hyperplane meeting the curve in real points only. More generally, given any divisor on such a curve, we may…

Algebraic Geometry · Mathematics 2021-06-29 Huu Phuoc Le , Dimitri Manevich , Daniel Plaumann

Let X be a singular affine normal variety with coordinate ring R and assume that there is an R-order admitting a stability structure such that the scheme of relevant semistable representations is smooth, then we construct a partial…

Rings and Algebras · Mathematics 2007-05-23 Lieven Le Bruyn , Stijn Symens

This paper discusses the topic of the minimum width of a regular resolution refutation of a set of clauses. The main result shows that there are examples having small regular resolution refutations, for which any regular refutation must…

Computational Complexity · Computer Science 2015-07-01 Alasdair Urquhart

We give two criteria for a divisor on complex smooth projective variety to be ample using the multiplier ideal sheaf and the model category.

Algebraic Geometry · Mathematics 2024-11-28 Seunghun Lee

The set of common numerical and analytical problems is introduced in the form of the generalized multidimensional discrete Poisson equation. It is shown that its solutions with square-summable discrete derivatives are unique up to a…

Mathematical Physics · Physics 2011-09-27 Roman Werpachowski

We consider a variational problem with boundary singularity and Dirichlet condition. We give a blow-up analysis for sequences of solutions of an equation with exponential nonlinearity. Also, we derive a compactness criterion under some…

Analysis of PDEs · Mathematics 2018-10-26 Samy Skander Bahoura

We consider the existence and multiplicity of solutions for a class of quasi-linear Schr\"{o}dinger equations which include the modified nonlinear Schr\"{o}dinger equations. A new perturbation approach is used to treat the sub-cubic…

Analysis of PDEs · Mathematics 2022-09-13 Chen Huang , Jianjun Zhang , Xuexiu Zhong

Recent quasi-optimal error estimates for the finite element approximation of total-variation regularized minimization problems require the existence of a Lipschitz continuous dual solution. We discuss the validity of this condition and…

Numerical Analysis · Mathematics 2021-06-28 Sören Bartels , Robert Tovey , Friedrich Wassmer

We develop two adaptive discretization algorithms for convex semi-infinite optimization, which terminate after finitely many iterations at approximate solutions of arbitrary precision. In particular, they terminate at a feasible point of…

Optimization and Control · Mathematics 2022-01-14 Jochen Schmid , Miltiadis Poursanidis

We construct affine algebras with an arbitrary amount of simple modules of each dimension.

Rings and Algebras · Mathematics 2015-12-17 Be'eri Greenfeld

This paper is devoted to Riemann-Hilbert problems with constraints. We obtain results characterizing the existence of solutions as well as the dimension of the solution space in terms of certain indices. As an application, we show how such…

Complex Variables · Mathematics 2018-08-22 Florian Bertrand , Giuseppe Della Sala

We revisit the problem of resolution of singularities of toric curves by iterating Nash modification. We give a bound on the number of iterations required to obtain the resolution. We also introduce a different approach on counting…

Algebraic Geometry · Mathematics 2018-08-20 Daniel Duarte , Daniel Green Tripp

Using exhaustion method and finite differences a new method to solve system of partial differential equations and is presented. This method allows design algorithm to solve linear and nonlinear systems in irregular domains. Applying this…

Numerical Analysis · Mathematics 2025-04-10 Miriam Sosa-Díaz , Faustino Sanchez-Garduno

We formulate a resolution of singularities algorithm for analyzing the zero sets of real-analytic functions in dimensions $\geq 3$. Rather than using the celebrated result of Hironaka, the algorithm is modeled on a more explicit and…

Classical Analysis and ODEs · Mathematics 2011-08-09 Tristan Collins , Allan Greenleaf , Malabika Pramanik

We are concerned with existence of regular solutions for non-Newtonian fluids in dimension three. For a certain type of non-Newtonian fluids we prove local existence of unique regular solutions, provided that the initial data are…

Analysis of PDEs · Mathematics 2018-07-09 Kyungkeun Kang , Hwa Kil Kim , Jae-Myoung Kim