A simple discharging method for forbidden subposet problems

Ryan R. Martin, Abhishek Methuku, Andrew Uzzell +1

The poset $Y_{k+1,2}$ consists of $k+2$ distinct elements $x_1$, $x_2$, \dots, $x_k$, $y_1$,$y_2$, such that $x_1\le x_2\le \cdots \le x_k\le y_1$,~$y_2$. The poset $Y'_{k+1…