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简介:设T是一希尔伯特空间算子,T=A+iB,其中AB是自伴算子.利用一类qusi-范数不等式及范数不等式,比较了‖T‖p与‖T‖p与‖(A^2+B^2)^1/2‖p和(‖A‖p^p+‖B‖p^p)^1/p之间的关系,得到当2≤p≤∞,‖A‖p^p=‖B‖p^p≤‖T‖p^p≤2^p-2(‖A‖p^p+‖B‖p^p);2^1/p-1/2‖(A^2+B^2)‖p≤‖T‖p≤2^1-1/2‖(A^2+B^2)1/2‖p,进而得到特殊情况‖T‖2^2=‖A‖2^2+‖B‖2^2和‖T‖2=‖(A^2+B^2)^1/2‖2,它们反映了‖·‖2的Euclidean特点.