Plummer–Stiebitz–Toft reformulation for independence number two
Plummer–Stiebitz–Toft conjecture. Every nnn-vertex graph GGG with α(G)≤2\alpha(G)\leq2α(G)≤2 contains K⌈n/2⌉K_{\lceil n/2\rceil}K⌈n/2⌉ as a minor.