可通过计算算子的范数及本性范数来了解算子的有界性和紧性。计算出了单位球上Dirichlet空间到Bloch空间的一个积分型算子的范数及本性范数。
The boundedness and compactness of operators is understood by calculating the norm and essential norm of operators.The norm and essential norm of an integral-type operator which maps Dirichlet space into Bloch-type space in the unit ball are discussed.