MathDB
a∘b is defined as a+b-ab

Source: Baltic Way 1994

December 22, 2011
algebra proposedalgebra

Problem Statement

Let ab=a+baba\circ b=a+b-ab. Find all triples (x,y,z)(x,y,z) of integers such that (xy)z+(yz)x+(zx)y=0(x\circ y)\circ z +(y\circ z)\circ x +(z\circ x)\circ y=0