

PlanetMath: arithmeticgeometricharmonic means inequality 
  See Also: arithmetic mean, geometric mean, harmonic mean, general means inequality, weighted power mean, power mean, rootmeansquare, proof of general means inequality, Jensen's inequality, derivation of geometric mean as the limit of the power mean, minimal and maximal number, proof of arithmeticgeometric means inequality using Lagrange multipliers 
  inequality, mean, arithmetic mean, geometric mean, harmonic mean 
  This is version 5 of arithmeticgeometricharmonic means inequality, born on 20010818, modified 20040605. 
 planetmath.org /encyclopedia/ArithmeticGeometricMeansInequality.html (158 words) 
