Rearrangement and convergence in spaces of measurable functions. Caponetti, D.; Trombetta, A.; Trombetta, G. — 2007 Journal of Inequalities and Applications [electronic only]
A Note on the Measure of Solvability D. Caponetti; G. Trombetta — 2004 Bulletin of the Polish Academy of Sciences. Mathematics Let X be an infinite-dimensional Banach space. The measure of solvability ν(I) of the identity operator I is equal to 1.