The so-called elements of geometrical proofs, and in general the elements of demonstrations, have a similar character; for the primary demonstrations, each of which is implied in many demonstrations, are called elements of demonstrations;
Honen antzera geometria-irudienak ere osagai izendatzen dira eta, orokorrean, demostrazioenak; demostrazio lehenak eta beste 1014b) demostrazio askoren baitan aurkitzen diren horiek baitira demostrazioen osagai izendatzen direnak.