We give a uniform proof that holds for every regular cardinal λ.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-fm220-2-2, author = {Assaf Rinot and Stevo Todorcevic}, title = {Rectangular square-bracket operation for successor of regular cardinals}, journal = {Fundamenta Mathematicae}, volume = {220}, year = {2013}, pages = {119-128}, zbl = {1284.03220}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm220-2-2} }
Assaf Rinot; Stevo Todorcevic. Rectangular square-bracket operation for successor of regular cardinals. Fundamenta Mathematicae, Tome 220 (2013) pp. 119-128. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm220-2-2/