Abstract. In this paper, essentially
developing the method of [1] (H. H. Bang and M. T. Thu, A
Gagliardo-Niremberg inequality for Orlicz spaces, East J. On
Approximations 10 (2004) 371--377) and [10] (E. M. Stein,
Functions of exponential type, Ann. Math. 65 (1957)
582--592), we give an extension of the Gagliardo-Nirenberg inequality to
Lorentz spaces.
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