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Find all triplets satisfying to inequalities.

Source: All-Russian Olympiad 2008 10.5

June 14, 2008
algebrasystem of equationsalgebra proposed

Problem Statement

Determine all triplets of real numbers x,y,z x,y,z satisfying 1\plus{}x^4\leq 2(y\minus{}z)^2,  1\plus{}y^4\leq 2(x\minus{}z)^2,  1\plus{}z^4\leq 2(x\minus{}y)^2.