On embedding of partially ordered sets in $({\hat{I}}^2\ddot{I}‰,{\le }_{RK})$

Nikolai L. Poliakov, Denis I. Saveliev

A natural question, which appeared as Problem 61 in Hart and van Mill's list of open problems on ${\hat{I}}^2\ddot{I}‰$ (2024), asks whether every finite partial order is embeddable in the Rudin--…