1. Pták's characterization of reflexivity in tensor products Creator: John, Kamil Format: bez média and svazek Type: model:article and TEXT Subject: reflexive Banach space, biorthogonal system, and $\pi $-tensor product Language: English Description: We characterize the reflexivity of the completed projective tensor products $X{\widetilde{\otimes }_\pi } Y$ of Banach spaces in terms of certain approximative biorthogonal systems. Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public