BOOK III. · II. · The philosophical and mathematical commentaries of Proclus on the first book of Euclid's elements (Vol. 2 of 2) : $b To which are added, A history of the restoration of Platonic theology, by the latter Platonists: And a translation from the Greek of Proclus's Theological elements

That a terminated straight line may be produced to any length in a straight line.