Hello All,

I'm trying to prove something that we know that is correct but can't find how to do it or any example to show how to solve it.

Any 2-coloring of the scope of equilateral triangle must create a monochromatic rectangular triangle (That all of its vertexes and in the same color and they are positioned on the scope of the original triangle).

This problem is connected to Ramsey theory.

Does anyone know how to prove it ?

Cheers,

Itamar