ABSTRACT
What makes it possible for A to be B, or what explains why A is B: why Phaedo is beautiful, why Simmias is tall or is taller when a cubit is added. The nature of the Form.
Plato is concerned with the conditions of the possibility of discourse, with meanings, standards or definitions as determining what it is possible to say. But they also determine what can be. Logoi are not the images of things, but things are images of logoi. Intelligible natures are found in what can be expressed in definitions. Plato is continuing with problems discussed by Parmenides and the Pythagoreans.2
