In this note we study the spectrum and the Waelbroeck spectrum of the derivative operator composed with isomorphic multiplication oper
On Whitney-type extension theorems on Banach spaces for $C^{1,ω}$, $C^{1,+}$, $C_{\mathrm{loc}}^{1,+}$, and $C_{\mathrm B}^{1,+}$-smooth functions
Characterizations of derivations on spaces of smooth functions
Isomorphisms of $\mathcal{C}(K, E)$ spaces and height of $K$
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