Before revision:  In the special case of ranked utilities where all agents on each side have the same  rankings over the agents on the other side (but not necessarily the same utilities) , we provide a characterisation for the space of stable matchings.
After revision:  We first consider the special case of ranked utilities where all agents on each side have the same rankings over the agents on the other side (but not necessarily the same utilities) , we provide a characterisation for the space of stable matchings.