Turán's problem and Ramsey numbers for trees

Zhi-Hong Sun, Lin-Lin Wang, Yi-Li Wu

Let $T_n^1=(V,E_1)$ and $T_n^2=(V,E_2)$ be the trees on $n$ vertices with $V=\{v_0,v_1,\dots ,v_{n-1}\}$, $E_1=\{v_0{v}_1,\dots ,v_0{v}_{n-3},v_{n-4}{v}_{n-2},v_{n-3}{v}_{n-1}\}$, and $E_2…