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Description of K‐spaces by means of J‐spaces and the reverse problem in the limiting real interpolation

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  • Bohumír Opic
  • Manvi Grover

Abstract

We establish conditions under which K‐spaces in the limiting real interpolation involving slowly varying functions can be described by means of J‐spaces and we also solve the reverse problem. To this end, we prove several versions of the fundamental lemma of the real interpolation theory. We apply our results to obtain density theorems for the corresponding limiting interpolation spaces.

Suggested Citation

  • Bohumír Opic & Manvi Grover, 2023. "Description of K‐spaces by means of J‐spaces and the reverse problem in the limiting real interpolation," Mathematische Nachrichten, Wiley Blackwell, vol. 296(9), pages 4002-4031, September.
  • Handle: RePEc:bla:mathna:v:296:y:2023:i:9:p:4002-4031
    DOI: 10.1002/mana.202100545
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