用线性弱正算子逼近

Approximation by Linear Weak Positive Operators

中文关键词:  正算子  弱正算子  逼近理论.

英文关键词:positive operators  weak positive operators  theory of approximation.

中文摘要:

      用线性正算子的逼近理论飞速发展，但正性是一个较强的限制，孙永生，王仁宏等研究过减弱正性限制，作者研究用线性弱正算子逼近，推广Korovkin定理和Grundmann定理等等.

英文摘要:

      Approximation theory by linear positive operators had been developed at a high speed,but positivity is stronger restriction. Sun Yongsheng and Wang R.H. had researched reducing restriction of positivity, author researches approximation by linear weak positive operators, generalizes Korovkin Theorem and Grundmann Theorem etc.