Abstract
Recently, Wickstead investigated the long-standing problem of adding an identity to a non-unital Banach lattice algebra. In this regard, he proved that, in the category whose objects are unital Banach lattice algebras and morphisms are identity preserving algebra and lattice homomorphisms, there is no reflection for \(c_{0}\) in which \(c_{0}\) can be embedded as an algebra and order ideal. The main purpose of this note is to describe an alternative category in which a suitable reflection of \(c_{0}\) can be located, producing a satisfactory lattice unitization of \(c_{0}\) with \(c_{0}\) as an algebra and order ideal.
Similar content being viewed by others
References
Adámek, J., Herrlich, H., Strecker, G.E.: Abstract and Concrete Categories. The Joy of Cats. Pure and Applied Mathematics. Wiley, New York (1990)
Aliprantis, C.D., Burkinshaw, O.: Positive Operators. Reprint of the: original, p. 2006. Springer, Dordrecht (1985)
Amor, M.A.B., Boulabiar, K., El Adeb, C.: Corrigendum to “extreme contractive operators on Stone f-algebras” [Indag. Math. 25 (2014) 93–103] [MR3131767]. Indag. Math. (N.S.) 28(5), 1109–1110 (2017)
Amor, M.A.B., Boulabiar, K., El Adeb, C.: Extreme contractive operators on Stone f-algebras. Indag. Math. (N.S.) 25(1), 93–103 (2014)
Bonsall, F.F., Duncan, J.: Complete Normed Algebras. Ergebnisse der Mathematik und ihrer Grenzgebiete, Band 80. Springer, New York (1973)
de Pagter, B.: f-Algebras and Orthomorphisms. Ph.D. thesis, Leiden (1981)
Huijsmans, C.B., de Pagter, B.: Averaging operators and positive contractive projections. J. Math. Anal. Appl. 113(1), 163–184 (1986)
Huijsmans, C.B., de Pagter, B.: Subalgebras and Riesz subspaces of an f-algebra. Proc. Lond. Math. Soc. (3) 48(1), 161–174 (1984)
Wickstead, A.W.: Banach lattice algebras: some questions, but very few answers. Positivity 21(2), 803–815 (2017)
Zaanen, A.C.: Riesz Spaces II. North-Holland Mathematical Library, vol. 30. North-Holland Publishing Co., Amsterdam (1983)
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Boulabiar, K., Hafsi, H. & Mahfoudhi, M. Adding an identity to a Banach lattice algebra: a look at a Wickstead’s counter-example from a norm-free point of view. Positivity 25, 1267–1272 (2021). https://doi.org/10.1007/s11117-021-00814-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11117-021-00814-9
Keywords
- Algebra homomorphism
- Banach lattice algebra
- Category
- Continuous function
- Identity
- Lattice homomorphism
- Stone f-algebra
- Stone homomorphism
- Unit