Given positive numbers and whose reciprocals add up to one, the product of two positive real numbers and is less than or equal to a weighted sum of and powers of and .
 R. B. Nelson, Proofs without Words II, More Exercises in Visual Thinking, Washington, DC: Mathematical Association of America, 2000.
 W. H. Young, "On Classes of Summable Functions and Their Fourier Series," Proceedings of the Royal Society A, 87, 1912 pp. 225–229.
Wolfram Demonstrations Project
Published: December 9 2013