## Differential and Integral Equations

- Differential Integral Equations
- Volume 23, Number 7/8 (2010), 795-799.

### Errata Corrige to: "Approximation by means of nonlinear integral operators in the space of functions with bounded $\varphi-$variation"

Laura Angeloni and Gianluca Vinti

#### Abstract

Here the authors want to point out that the term $I_2,$ of Proposition 2 of the original paper ([2]), has to be estimated in a different way. Moreover, now the proof of Theorem 4 of the original paper holds with the new assumption (2) (involving $K_w.3)'$ mentioned below), instead of (6.2) of [2] (involving $K_w.3)$ of the original paper), while, since Theorem 3 (convergence theorem) can be proved with both assumptions $K_w.3)$ and $K_w.3)'$, we prefer here to use directly $K_w.3)'$, in analogy with condition (2). Let us notice that it is easy to see that the two conditions $K_w.3)$ and $K_w.3)'$ cannot be compared. Here we want also to point out that in the convergence theorem of [3] as well as in Lemma 2 of [3], a similar problem occurs and it is solved in the same way proving that $V_{\varphi}[\lambda (H_w \circ f-f)]{\mbox{$\rightarrow$}} 0$, as $w{\mbox{$\rightarrow$}} +\infty$ for sufficiently small $\lambda>0,$ using assumption $K_w.3)$ (see Remark below).

#### Article information

**Source**

Differential Integral Equations, Volume 23, Number 7/8 (2010), 795-799.

**Dates**

First available in Project Euclid: 20 December 2012

**Permanent link to this document**

https://projecteuclid.org/euclid.die/1356019196

**Mathematical Reviews number (MathSciNet)**

MR2654270

**Zentralblatt MATH identifier**

1240.26016

**Subjects**

Primary: 26A45: Functions of bounded variation, generalizations 26A46: Absolutely continuous functions 41A25: Rate of convergence, degree of approximation 41A35: Approximation by operators (in particular, by integral operators) 47G10: Integral operators [See also 45P05]

#### Citation

Angeloni, Laura; Vinti, Gianluca. Errata Corrige to: "Approximation by means of nonlinear integral operators in the space of functions with bounded $\varphi-$variation". Differential Integral Equations 23 (2010), no. 7/8, 795--799. https://projecteuclid.org/euclid.die/1356019196