This is the revision history for bijection in <freenode.net:#perlbot>

factoid_idsubjectcopulapredicateauthornamespace
13866 bijection is a mapping that is both one-to-one (an injection) and onto (a surjection), i.e. a function which relates each member of a set S (the domain) to a separate and distinct member of another set T (the range), where each member in T also has a corresponding member in S. daemon <*:##NULL>
13865 bijection is define bijection daemon <*:##NULL>