ifn≥R(r;k1,k2,.,k), for any r-coloring of K,there exists a monochromatic ki-clique with color i for some ie1,2,...rh. r-coloring:(☒）-L,2rl if n ≥ R(r; k1, k2, ... , kr), for any r-coloring of Kn, there exists a monochromatic ki-clique with color i for some i∈{1, 2, ..., r}. Kn = ￾[n] 2 ⇥ r-coloring f : ￾[n] ⇥ ￾ {1, 2,...,r} 2