Function spaces not containing $\ell_{1}$

For $Ω$ bounded and open subset of $\mathbb{R}^{d_{0}}$ and $X$ a reflexive Banach space with 1-symmetric basis, the function space $JF_{X}(Ω)$ is defined. This class of spaces includes the classical James function space. Every member of this class is separable and has non-separable dual. We provide a proof of topological nature that $JF_{X}(Ω)$ does not contain an isomorphic copy of $\ell_{1}$. We also investigate the structure of these spaces and their duals.

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