2-colouring shift-chains
A shift-chain is an $ r $-uniform hypergraph $ \mathcal{H} $ on vertex set $ [n] $ with the property that, for any two edges $ \{ e_1, \ldots, e_r \} $ and $ \{ f_1, \ldots, f_r \} $ with $ e_1<\cdots<e_r $ and $ f_1<\cdots<f_r $, either $ e_i \le f_i $ for all $ i \in [r] $ or $ f_i \le e_i $ for all $ i \in [r] $. It...