We improve on several mixed weak-type inequalities both for the Hardy-Littlewood maximal function and for Calderón-Zygmund operators. These types of inequalities were considered by Muckenhoupt and Wheeden and later on by Sawyer estimating the L1,∞(uv) norm of v −1T (f v) for special cases. The emphasis is made in proving new and more precise quantitativeestimates involving the Ap or A∞ constants of the weights involved.
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