This analysis demonstrates a quantitative version of the reflexivity theorem in Banach spaces, highlighting nonreflexivity and nonbounded completeness.
In this note, we will use a measure of nonreflexivity of Banach spaces, a measure of nonbounded completeness of bases, and a measure of nonshrinkingness of bases to prove a quantitative version of the well‐known reflexivity theorem due to R. C. James.
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Xuemei Xue (2025) studied this question.
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