MathDB
Muirhead theorem??? (Italy 1993)

Source:

June 4, 2015
inequalities

Problem Statement

Prove the following inequality for any positive real numbers a,b,c not exceeding 1 a2b+b2c+c2a+1a2+b2+c2a^2b+b^2c+c^2a+1\ge a^2+b^2+c^2