It is well known that in a free group , one has , where E is the set of all the generators. We show that the (completely) bounded multiplier norm of any set satisfying the Leinert condition depends only on its cardinality. Consequently, based on a result of Wysoczański, we obtain a formula for .
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-cm124-2-10, author = {\'Eric Ricard and Ana-Maria Stan}, title = {The Herz-Schur multiplier norm of sets satisfying the Leinert condition}, journal = {Colloquium Mathematicae}, volume = {122}, year = {2011}, pages = {255-274}, zbl = {1253.43002}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm124-2-10} }
Éric Ricard; Ana-Maria Stan. The Herz-Schur multiplier norm of sets satisfying the Leinert condition. Colloquium Mathematicae, Tome 122 (2011) pp. 255-274. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm124-2-10/