es either
| its extension or comprehension and 'conversely'.  It may be said that there
| are no equivalent terms in logic, since the only difference between such
| terms would be merely external and grammatical, while in logic terms
| which have the same meaning are identical.  I fully admit that.
| Indeed, the process of getting an equivalent for a term is
| an identification of two terms previously diverse.  It is,
| in fact, the process of nutrition of terms by which they
| get all their life and vigor 