- The Principle of Commonality. Wherever several things are F, this is because they participate in or imitate a single Idea of F (Phd. 100c; Men. 72c, 75a; Rep. 5. 476a10, 597c).
- The Principle of Separation. The Idea of F is distinct from all the things that are F (Phd. 74c; Smp. 211b).
- The Principle of Self-Predication. The Idea of F is itself F (Hp. Ma. 292e; Prt. 230c–e; Prm. 132a–b).
- The Principle of Purity. The Idea of F is nothing but F (Phd. 74c; Smp. 211e).
- The Principle of Uniqueness. Nothing but the Idea of F is really, truly, altogether F (Phd. 74d, Rep. 5. 479a–d).
- The Principle of Sublimity. Ideas are everlasting, they have no parts and undergo no change, and they are not perceptible to the senses (Phd. 78d; Smp. 211b).
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