Representing Quasi-orders by Embeddability Ordering of Families of Topological Spaces

An elementary argument constructs, for each cardinal α, a topological space whose subspaces, ordered by homeomorphic embeddability, can model every partial order on α-many points. We show how to modify this procedure to deal also with quasi-orders (where the antisymmetry condition may fail), obtaining an initial estimate of the cardinality of the space then required.