Turán's problem for trees $T_n$ with maximal degree $n-4$

Zhi-Hong Sun, Yin-Yin Tu

For $n\ge 6$ let $V=\{v_0,v_1,\dots ,v_{n-1}\}$, $E_1=\{v_0{v}_1,\dots ,v_0{v}_{n-4},v_1{v}_{n-3},v_1{v}_{n-2}$, $v_1{v}_{n-1}\}$, $E_2=\{v_0v_1,\ldots,v_0v_{n-4},v_1v_{n-3},v_1v_{n-2},v_2v_…