When Does the Equality <em>J</em>(<em>X</em><sup>*</sup>) = <em>J</em>(<em>X</em>) Hold for a Two-dimensional Banach Space <em>X</em>?

中国科学院数学与系统科学研究院期刊网

When Does the Equality J(X^*) = J(X) Hold for a Two-dimensional Banach Space X?

Kichi-Suke SAITO, Masahiro SATO, Ryotaro TANAKA

Acta Mathematica Sinica . 2015, (8): 1303 -1314 . DOI: 10.1007/s10114-015-4539-3