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arXiv · 2610.36771

A Bounded Closed Convex Set in $c_0(\mathbb{C})$ without Modulus Support Functionals

Xin Luo
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Abstract

We construct a bounded closed convex set in $c_0(\mathbb{C})$ on which no nonzero continuous complex-linear functional attains its maximum modulus. Consequently, this answers in the negative the two longstanding questions raised by Deville, Godefroy and Zizler in \cite[p. 35]{DGZ}. The construction uses a small perturbation of the identity on $c_0(\mathbb{R})$.

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Xin Luo. 2026-10-27. A Bounded Closed Convex Set in $c_0(\mathbb{C})$ without Modulus Support Functionals. https://arxiv.org/abs/2610.36771

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