A note on Spanne-type result on grand Morrey spaces

Abstract 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.