inequality in a,b,c
Source: Ireland 2005
July 6, 2009
inequalitiessearchinequalities proposed
Problem Statement
Let be nonnegative real numbers. Prove that:
\frac{1}{3}((a\minus{}b)^2\plus{}(b\minus{}c)^2\plus{}(c\minus{}a)^2) \le a^2\plus{}b^2\plus{}c^2\minus{}3 \sqrt[3]{a^2 b^2 c^2 } \le (a\minus{}b)^2\plus{}(b\minus{}c)^2\plus{}(c\minus{}a)^2.