By using real analysis and weight functions, we obtain a few equivalent statements of a Hilbert-type integral inequality in the whole plane related to the kernel of exponent function with intermediate variables. The constant factor related to the gamma function is proved to be the best possible. We also consider some particular cases and the operator expressions.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6154078PMC
http://dx.doi.org/10.1186/s13660-018-1834-4DOI Listing

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