👉 Ramsey's theorem is a fundamental result in combinatorics, graph theory, and algebraic geometry. It was established by mathematician Richard K. Guy in 1976. The theorem states that for any finite bipartite graph G = (V,E), there exists a partition of the vertices into two sets such that the number of edges in each set is at least the number of vertices in the graph, and the sum of the degrees of the vertices in both partitions is equal