The formula is proved for precompact sets M of weakly compact operators on a Banach space. Here ϱ(M) is the joint spectral radius (the Rota-Strang radius), is the Hausdorff spectral radius (connected with the Hausdorff measure of noncompactness) and r(M) is the Berger-Wang radius.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-sm149-1-2,
author = {Victor S. Shulman and Yuri\u\i\ V. Turovskii},
title = {Formulae for joint spectral radii of sets of operators},
journal = {Studia Mathematica},
volume = {151},
year = {2002},
pages = {23-37},
zbl = {1016.47006},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-sm149-1-2}
}
Victor S. Shulman; Yuriĭ V. Turovskii. Formulae for joint spectral radii of sets of operators. Studia Mathematica, Tome 151 (2002) pp. 23-37. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-sm149-1-2/