Brézis-Gallouët-Wainger type inequality with a double logarithmic term in the Hölder space: Its sharp constants and extremal functions |
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Authors: | Kei Morii Tokushi Sato |
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Institution: | a Department of Mathematics, Kyoto University, Kyoto, 606-8502, Japan b Mathematical Institute, Tohoku University, Sendai, 980-8578, Japan c Institute of Mathematical Sciences, National Taiwan University, Taipei, 106, Taiwan |
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Abstract: | We investigate the sharp constants in a Brézis-Gallouët-Wainger type inequality with a double logarithmic term in the Hölder space in a bounded domain in Rn. Ibrahim, Majdoub and Masmoudi gave the sharp constant in the two-dimensional case. We make precise estimates to give the sharp constants, and pass to the case of higher dimensions n≥2. We can also show that the inequality with fixed constants including the sharp ones admits an extremal function under a suitable condition when the domain is a ball. |
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Keywords: | Primary 46E35 Secondary 35J85 |
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