%0 Journal Article
%T ON A THEOREM OF J.T. LEWIS<br>关于J.T.Lewis的一个定理
%A 史应光
%J 计算数学
%D 1981
%I 
%X This note points out that the sufficiency half of the characterization theoremfor best L_1 approximation with interpolatory constraints given by J. T. Lewis~1,Theorem5.3]is not valid. Our theorem 1 gives a general characterization theorem, whence if anadditional condition is assumed, then our theorem 2 will give a complete statement ofLewis' theorem.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=37F46C35E03B4B86&jid=CC77F3CEF526D9CF0B3021650FB4E57E&aid=77C4C03605C86064A327B5EEA0CD5A8C&yid=AA64127AB7DEB65D&vid=38B194292C032A66&iid=38B194292C032A66&sid=4FE459D71E3BF8EB&eid=866F8A6B640835A7&journal_id=0254-7791&journal_name=计算数学&referenced_num=0&reference_num=0