Abstract
Let $\mu$ be a non-negative Borel measure on $\mathbb{R}^d$ which only satisfies some growth condition, we study two-weight norm inequalities for fractional maximal functions associated to such $\mu$. A necessary and sufficient condition for the maximal operator to be bounded from $L^p(v)$ into weak $L^{q}(u)$ $(1\leq p\leq q<\infty)$ is given. Furthermore, by using certain Orlicz norm, a strong type inequality is obtained.
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