51. CMB 1997 (vol 40 pp. 10)
|Convex functions on Banach spaces not containing $\ell_1$ |
There is a sizeable class of results precisely relating boundedness, convergence and differentiability properties of continuous convex functions on Banach spaces to whether or not the space contains an isomorphic copy of $\ell_1$. In this note, we provide constructions showing that the main such results do not extend to natural broader classes of functions.
Categories:46A55, 46B20, 52A41