| Texto completo | |
| Autor(es): |
Candido, Leandro
;
Koszmider, Piotr
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | STUDIA MATHEMATICA; v. 233, n. 3, p. 209-226, 2016. |
| Citações Web of Science: | 1 |
| Resumo | |
Given a compact Hausdorff space K we consider the Banach space of real continuous functions C(K-n) or equivalently the n-fold injective tensor product (circle times) over cap C-n(epsilon)(K) or the Banach space of vector valued continuous functions C(K,C(K,C(K...,C(K)...). We address the question of the existence of complemented copies of c(0)(omega(1)) in (circle times) over cap C-n(epsilon)(K) under the hypothesis that C(K) contains an isomorphic copy of c(0)(omega(1)). This is related to the results of E. Saab and P. Saab that X (circle times) over cap Y-epsilon contains a complemented copy of c(0), if one of the infinite dimensional Banach spaces X or Y contains a copy of c(0) and of E. M. Galego and J. Hagler that it follows from Martin's Maximum that if C(K) has density omega(1) and contains a copy of c(0)(omega(1)), then C(KXK) contains a complemented copy c(0)(omega(1)). Our main result is that under the assumption of (sic) for every n is an element of N there is a compact Hausdorff space K-n of weight omega(1) such that C(K) is Lindelof in the weak topology, C(K-n) contains a copy of c(0)(omega(1)), C(K-n(n)) does not contain a complemented copy of c(0)(omega(1)) while C(K-n(n+1)) does contain a complemented copy of c(0)(omega(1)). This shows that additional set-theoretic assumptions in Galego and Hagler's nonseparable version of Cembrano and Freniche's theorem are necessary as well as clarifies in the negative direction the matter unsettled in a paper of Dow, Junnila and Pelant whether half-pcc Banach spaces must be weakly pcc. (AU) | |
| Processo FAPESP: | 13/20703-6 - Aplicações de combinatória infinitária em Espaços de Banach das formas $C(K)$, $C(K\times L)$, $C(K,X)$ e estruturas relacionadas |
| Beneficiário: | Leandro Candido Batista |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |