scholarly journals On differentiability of mappings with finite dilation

2015 ◽  
Vol 62 (1) ◽  
pp. 133-141
Author(s):  
Małgorzata Turowska

Abstract We study mappings f : (a,b) → Y with finite dilation having Lebesgue integrable majorant, where Y is a real normed vector space. We construct Lipschitz mapping f : (a,b) → Y, dim Y = ∞ , which is nowhere differentiable but its graph has everywhere trivial contingent. We show that if the contingent of the graph of a mapping with finite dilation is a nontrivial space, then f is almost everywhere differentiable.

Author(s):  
Joshua U. Turner ◽  
Michael J. Wozny

Abstract A rigorous mathematical theory of tolerances is an important step toward the automated solution of tolerancing problems. This paper develops a mathematical theory of tolerances in which tolerance specifications are interpreted as constraints on a normed vector space of model variations (M-space). This M-space provides concise representations for both dimensional and geometric tolerances, without deviating from the established tolerancing standards. This paper extends the authors’ previous work to include examples of geometric orientation and form tolerances. We show that the M-space theory supports the development of effective algorithms for the solution of tolerancing problems. Through the use of solid modeling technology, it is possible to automate the solution of such problems.


Mathematics ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 2229
Author(s):  
Emanuel Guariglia ◽  
Kandhasamy Tamilvanan

This paper deals with the approximate solution of the following functional equation fx7+y77=f(x)+f(y), where f is a mapping from R into a normed vector space. We show stability results of this equation in quasi-β-Banach spaces and (β,p)-Banach spaces. We also prove the nonstability of the previous functional equation in a relevant case.


1974 ◽  
Vol 11 (1) ◽  
pp. 15-30 ◽  
Author(s):  
T.J. Cooper ◽  
J.H. Michael

Two fixed point theorems for a subset C of a normed vector space X are established by using the concept of centre. These results differ from previous fixed point theorems in that X is assumed to have a topology T as well as a norm. The norm is required to be lower semi-continuous with respect to T and C is required to be convex, bounded with respect to the norm and compact with respect to T.


2013 ◽  
Vol 113 (1) ◽  
pp. 128 ◽  
Author(s):  
M. Huang ◽  
X. Wang

Let $E$ be a real normed vector space with $\dim(E)\geq 2$, $D$ a proper subdomain of $E$. In this paper we characterize uniform domains in $E$ in terms of the uniform domain decomposition property. In addition, we discuss the relation between quasiballs and domains with the quasiball decomposition property in $\mathsf{R}^n$.


Positivity ◽  
2017 ◽  
Vol 22 (1) ◽  
pp. 105-138
Author(s):  
Piotr Gwiazda ◽  
Anna Marciniak-Czochra ◽  
Horst R. Thieme

1993 ◽  
Vol 48 (3) ◽  
pp. 353-363 ◽  
Author(s):  
Dominique Azé ◽  
Jean-Paul Penot

Some extensions to the non reflexive case of continuity results for the Legendre-Fenchel transform are presented following an approach due to J.-L. Joly. We compare the topology introduced by J.-L. Joly and the Mosco-Beer topology introduced by G. Beer. In particular, in the case of the space of closed proper convex functions defined on the dual of a normed vector space they coincide.


1971 ◽  
Vol 17 (3) ◽  
pp. 245-248 ◽  
Author(s):  
J. W. Baker ◽  
J. S. Pym

The main theorem of this paper is a little involved (though the proof is straightforward using a well-known idea) but the immediate corollaries are interesting. For example, take a complex normed vector space A which is also a normed algebra with identity under each of two multiplications * and ∘. Then these multiplications coincide if and only if there exists α such that ‖a ∘ b ‖ ≦ α ‖ a * b ‖ for a, b in A. This is a condition for the two Arens multiplications on the second dual of a Banach algebra to be identical. By taking * to be the multiplication of a Banach algebra and ∘ to be its opposite, we obtain the condition for commutativity given in (3). Other applications are concerned with conditions under which a bilinear mapping between two algebras is a homomorphism, when an element lies in the centre of an algebra, and a one-dimensional subspace of an algebra is a right ideal. An example shows that the theorem is false for algebras over the real field, but Theorem 2 gives the parallel result in this case.


Positivity ◽  
2017 ◽  
Vol 22 (1) ◽  
pp. 139-140 ◽  
Author(s):  
Piotr Gwiazda ◽  
Anna Marciniak-Czochra ◽  
Horst R. Thieme

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