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Displaying similar documents to “The Cauchy integral operator on the predual of a Morrey space.”

Commutators of the fractional maximal function on variable exponent Lebesgue spaces

Pu Zhang, Jianglong Wu (2014)

Czechoslovak Mathematical Journal

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Let M β be the fractional maximal function. The commutator generated by M β and a suitable function b is defined by [ M β , b ] f = M β ( b f ) - b M β ( f ) . Denote by 𝒫 ( n ) the set of all measurable functions p ( · ) : n [ 1 , ) such that 1 < p - : = ess inf x n p ( x ) and p + : = ess sup x n p ( x ) < , and by ( n ) the set of all p ( · ) 𝒫 ( n ) such that the Hardy-Littlewood maximal function M is bounded on L p ( · ) ( n ) . In this paper, the authors give some characterizations of b for which [ M β , b ] is bounded from L p ( · ) ( n ) into L q ( · ) ( n ) , when p ( · ) 𝒫 ( n ) , 0 < β < n / p + and 1 / q ( · ) = 1 / p ( · ) - β / n with q ( · ) ( n - β ) / n ( n ) .