Lineability and spaceability for the weak form of Peano's theorem and vector-valued sequence spaces

TL;DR

This paper applies spaceability techniques to analyze the algebraic genericity of the weak form of Peano's theorem on $c_0$ and extends results on the structure of subsets within vector-valued sequence spaces.

Contribution

It introduces a novel application of spaceability to the weak form of Peano's theorem and generalizes the existence of large subspaces within certain vector-valued sequence spaces.

Findings

Existence of a closed $rak{c}$-dimensional subspace where the weak Peano's theorem fails on $c_0$

Extension of known results to the existence of maximal dimension subspaces in $ell_p(X)$-spaces

Application of spaceability techniques to algebraic genericity in differential equations

Abstract

Two new applications of a technique for spaceability are given in this paper. For the first time this technique is used in the investigation of the algebraic genericity property of the weak form of Peano's theorem on the existence of solutions of the ODE $u'=f(u)$ on $c_0$. The space of all continuous vector fields $f$ on $c_0$ is proved to contain a closed $\mathfrak{c}$-dimensional subspace formed by fields $f$ for which -- except for the null field -- the weak form of Peano's theorem fails to be true. The second application generalizes known results on the existence of closed $\mathfrak{c}$-dimensional subspaces inside certain subsets of $\ell_p(X)$-spaces, $0 < p < \infty$, to the existence of closed subspaces of maximal dimension inside such subsets.