Browsing by Subject "Polynomials"
Now showing items 120 of 72

A framework for polynomial time query learnability
(1990)
External research report
Open Access 
A new subdivision algorithm for the flow propagation using polynomial algebras
(20180801)
Article
Open AccessThe Jet Transport method has emerged as a powerful tool for the numerical integration of ordinary differential equations; it uses polynomial expansions to approximate the flow map associated to the differential equation ... 
A polynomial bound for untangling geometric planar graphs
(200912)
Article
Open AccessTo untangle a geometric graph means to move some of the vertices so that the resulting geometric graph has no crossings. Pach and Tardos (Discrete Comput. Geom. 28(4): 585–592, 2002) asked if every nvertex geometric planar ... 
A polynomialtime algorithm for the Lambek calculus with brackets of bounded order
(Dagstuhl Publishing, 2017)
Conference report
Open AccessLambek calculus is a logical foundation of categorial grammar, a linguistic paradigm of grammar as logic and parsing as deduction. Pentus (2010) gave a polynomialtime algorithm for determining provability of bounded depth ... 
A simple proof of the spectral excess theorem for distanceregular graphs
(Elsevier, 20100415)
Article
Restricted access  publisher's policyThe spectral excess theorem provides a quasispectral characterization for a (regular) graph Γ with d+1 distinct eigenvalues to be distanceregular graph, in terms of the excess (number of vertices at distance d) of each ... 
A solution to the tennis ball problem
(2005)
Article
Open AccessWe present a complete solution to the socalled tennis ball problem, which is equivalent to counting the number of lattice paths in the plane that use North and East steps and lie between certain boundaries. The solution ... 
A unified position analysis of the Dixon and the generalized Peaucellier linkages
(20151201)
Article
Open AccessThis paper shows how, using elementary Distance Geometry, a closure polynomial of degree 8 for the Dixon linkage can be derived without any trigonometric substitution, variable elimination, or artifice to collapse mirror ... 
An alternative procedure to obtain the mortality rate with nonlinear functions: Application to the case of the Spanish population
(Public Library of Science (PLOS), 20191015)
Article
Open AccessThis paper presents an alternative calculation procedure to calculate the mortality rate, exploiting the data available in the Eurostat demography database for Spain. This methodology has been devised based on two of the ... 
Annuli for the zeros of a polynomial
(201410)
Article
Restricted access  publisher's policy 
Approximate results for rainbow labelings
(201703)
Article
Open AccessA simple graph G=(V,E) is said to be antimagic if there exists a bijection f:E¿[1,E] such that the sum of the values of f on edges incident to a vertex takes different values on distinct vertices. The graph G is distance ... 
Automating Resolution is NPhard
(Institute of Electrical and Electronics Engineers (IEEE), 2019)
Conference report
Open AccessWe show that the problem of finding a Resolution refutation that is at most polynomially longer than a shortest one is NPhard. In the parlance of proof complexity, Resolution is not automatizable unless P = NP. Indeed, ... 
Basis expansions and roots of Ehrhart polynomials
(2004)
Article
Open Access 
Boolean decomposition using twoliteral divisors
(Institute of Electrical and Electronics Engineers (IEEE), 2004)
Conference report
Open AccessThis paper is an attempt to answer the following question: how much improvement can be obtained in logic decomposition by using Boolean divisors? Traditionally, the existence of too many Boolean divisors has been the main ... 
Boundary value problems for Schrödinger operators on a path
(20120525)
External research report
Open AccessIn this work, we concentrate on determining explicit expressions, via suitable orthogonal polynomials on the line, for the Green function associated with any regular boundary value problem on a weighted path, whose weights ... 
Capturing points with a rotating polygon (and a 3D extension)
(201904)
Article
Open AccessWe study the problem of rotating a simple polygon to contain the maximum number of elements from a given point set in the plane. We consider variations of this problem where the rotation center is a given point or lies on ... 
Channel estimation for transform modulations in mobile communications
(1996)
Conference report
Open AccessThis paper deals with dataaided channel estimation in systems using OFDM modulation. We formulate a pilot symbolbased channel estimator and compare it with the pilottone one proposed in [1]. Although this paper focuses ... 
Characterizing tractability by tissuelike Psystems
(Springer, 2010)
Part of book or chapter of book
Restricted access  publisher's policyIn the framework of recognizer cell–like membrane systems it is well known that the construction of exponential number of objects in polynomial time is not enough to efficiently solve NP–complete problems. Nonetheless, ... 
Classes of bounded nondeterminism
(1988)
External research report
Open AccessWe study certain language classes located between P and N P that are defined by polynomial time machines with a bounded amount of nondeterminism. We observe that these classes have complete problems and find a characterization ... 
Comparison of Bspline and Zernike fitting techniques in complex wavefront surfaces
(Proc.SPIE Press, 20050613)
Article
Open Access 
Darboux integrals for Schrödinger planar vector fields via Darboux transformations
(20120714)
Article
Open AccessIn this paper we study the Darboux transformations of planar vector fields of Schr odinger type. Using the isogaloisian property of Darboux transformation we prove the \invariance" of the objects of the \Darboux theory ...