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On condition of quasisimilar, quasinormal and pure dominant operators in existence of essential spectra in an infinite dimensional Hilbert spaces 无限维Hilbert空间中本质谱存在拟相似、拟正规和纯优势算子的条件
Journal of Mathematics and Data Science (JMDS) Pub Date : 2023-10-14 DOI: 10.51317/jmds.v1i1.423
Peter Githara Rugiri
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