Oğur, Oğuz2021-11-112021-11-112020-06-30https://doi.org/10.31801/cfsuasmas.680388http://hdl.handle.net/20.500.12575/76025In this paper, we introduce the grand Lorentz sequence spaces ℓ_{p,q)}^{θ} and study on some topological properties. Also, we characterize some properties of the multiplication operator, such as compactness, Fredholmness etc., defined on ℓ_{p,q)}^{θ}.enGrand Lorentz sequence spacesMultiplication operatorCompactnessArticle6917717812618-6470