Weak Tchebycheff Systems

On a class of weak Tchebycheff systems

In this paper we study the approximation power, the existence of a normalized B-basis and the structure of a degree-raising process for spaces of the form span < 1, x, . . . , x, u(x), v(x) >, requiring suitable assumptions on the functions u and v. The results about degree raising are detailed for special spaces of this form which have been recently introduced in the area of CAGD.

Combinatorics of generalized Tchebycheff polynomials

By considering a family of orthogonal polynomials generalizing the Tchebycheff polynomials of the second kind we refine the corresponding results of De Sainte-Catherine and Viennot on Tchebycheff polynomials of the second kind (Lecture Notes in Mathematics, vol. 1171, 1985, Springer-Verlag, 120). © 2003 Elsevier Science Ltd. All rights reserved.

Tchebycheff Approximation in a Compact Metric Space

The Tchebycheff Norm for Ranking DMUs in Cellular Manufacturing Systems with Assignment Worker

This paper develops an integer mathematical programming model to design the cellular manufacturing systems under data envelopment analysis. Since workers have an important role in doing jobs on machines, assignment of workers to cells becomes a crucial factor for fully utilization of cellular manufacturing systems (CMS). The aim of the proposed is to minimize backorder costs and intercellul...

Weak Reflections and Weak Factorization Systems

A (functorial) weak reflection in a category C is essentially a sharply pointed endofunctor (T, η) on C, i.e., one for which ηTA is a split mono for each A ∈C. Using a result in [AHRT], we obtain the following “weak” version of one of the main results of [CHK]: every weak reflection (T, η) (in a category with finite products) comes from a (functorial) weak factorization system (LT ,RT ) (throug...