Bibasic sequences are used to study relative weak compactness
and relative norm compactness of limited sets.
limited sets, $L$-sets, bibasic sequences, the Dunford-Pettis property
46B20 - Geometry and structure of normed linear spaces
46B28 - Spaces of operators; tensor products; approximation properties [See also 46A32, 46M05, 47L05, 47L20]
28B05 - Vector-valued set functions, measures and integrals [See also 46G10]