算子的最佳非负逼近

Acta Mathematica Sinica, Chinese Series ›› 1980, Vol. 23 ›› Issue (6) : 901-907.

中国科学院数学与系统科学研究院期刊网
Acta Mathematica Sinica, Chinese Series ›› 1980, Vol. 23 ›› Issue (6) : 901-907. DOI: 10.12386/A1980sxxb0087
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