Full Idea
Anaxagoras, in his assertion of a Mind pure and unmixed, affirms a simplex First and a sundered One, though writing long ago he failed in precision.
Gist of Idea
Anaxagoras's concept of supreme Mind has a simple First and a multiple One
Source
report of Anaxagoras (fragments/reports [c.460 BCE]) by Plotinus - The Enneads 5.1.09
Book Reference
Plotinus: 'The Enneads', ed/tr. Mackenna,Stephen [Penguin 1991], p.357
A Reaction
The crunch question is whether the supreme One or Mind is part of Being, or is above and beyond Being. Plotinus claims that Anaxagoras was on his side (with Plato, against Parmenides).
Related Idea
Idea 21821 Plato's Parmenides has a three-part theory, of Primal One, a One-Many, and a One-and-Many [Plato, by Plotinus]