Results demonstrate the interaction of fractional integral operators in grand Morrey spaces, highlighting differences in summability parameters.
We prove a Spanne-type result for the fractional integral operator on grand Morrey spaces, where the target space is a double-aggrandized Morrey space, while the source space is just a grand Morrey space. This contrasts with the Adams-type result, where both the source and target spaces belong to the same grand Morrey-type space, albeit with different summability parameters.
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Humberto Rafeiro (2026) studied this question.
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