The connected size Ramsey number for matchings versus small disconnected graphs

Abstract

Let F, G,  and H be simple graphs. The notation F → (G, H) means that if all the edges of F are arbitrarily colored by red or blue, then there always exists either a red subgraph G or a blue subgraph H. The size Ramsey number of graph G and H,  denoted by r̂(G, H) is the smallest integer k such that there is a graph F with k edges satisfying F → (G, H). In this research, we will study a modified size Ramsey number, namely the connected size Ramsey number. In this case, we only consider connected graphs F satisfying the above properties. This connected size Ramsey number of G and H is denoted by r̂_c(G, H). We will derive an upper bound of r̂_c(nK₂, H), n ≥ 2 where H is 2P_m or 2K_1, t,  and find the exact values of r̂_c(nK₂, H),  for some fixed n.