Let $n$ be a positive integer and $\prec$ an arbitray total order on $\{1,\dots,n\}$. I associate to this order a vector $v$ with one coordinate for every pair $(i,j)$ s.t. $1\leq i\neq j \leq n$, by this definition:
$$v_{ij} = \left\{\begin{array}{cc}1 & i\prec j \\ 0 & i\succ j\end{array}\right. $$

This vector satisfies the following obvious linear inequalities for every distinct triples $1 \leq i,j,k \leq n$:

1)$0\leq v_{ij}$,

2)$v_{ij}+v_{ji}=1$,

3)$v_{ik} \leq v_{ij}+v_{jk} $.

Does these inequalities characterize the convex hull of all vectors associated to total orders?