@article{oai:u-ryukyu.repo.nii.ac.jp:02005345,
 author = {Nishishiraho, Toshihiko and 西白保, 敏彦},
 journal = {Ryukyu mathematical journal},
 month = {Dec},
 note = {We give estimates for the degree of the best approximation by elements of closed linear subspaces associated with a sequence of projection operators on Banach spaces and obtain inverse theorems of Bernstein type. The results are applied to the best approximation by trigonometric polynomials in homogeneous Banach spaces which include the classical function spaces, as special cases., 紀要論文},
 pages = {75--86},
 title = {Estimates for the degree of best approximation in Banach spaces},
 volume = {11},
 year = {1998}
}