1. (27) This static conception of energeiai, ' Actualities,' is meant to do what the opseis of the geometers do

2. Not enough was known about some of the technical issues: the geometers worked by a mixture of inspired guesswork and close familiarity with examples.

3. So much of the ``recent geometry of the triangle'' is connected with the properties of ``Antiparallels,'' that it is a matter of some interest to geometers to ascertain when they came to be recognized as worthy of a distinctive name, and when the name now in use was first applied