include "formal_topology/o-basic_pairs_to_o-basic_topologies.ma".
include "formal_topology/basic_pairs.ma".
include "formal_topology/basic_topologies.ma".
include "formal_topology/o-basic_pairs_to_o-basic_topologies.ma".
include "formal_topology/basic_pairs.ma".
include "formal_topology/basic_topologies.ma".