Ideas of Diogenes (Apoll), by Theme

[Greek, c.480 - 420 BCE, Born in Apollonia, in Crete. A doctor. Lived in Athens for a while.]

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1. Philosophy / B. History of Ideas / 2. Ancient Thought
Diogenes of Apollonia was the last natural scientist [Simplicius]
9. Objects / F. Identity among Objects / 7. Indiscernible Objects
Each thing must be in some way unique
12. Knowledge Sources / A. A Priori Knowledge / 2. Self-Evidence
Start a thesis with something undisputable
12. Knowledge Sources / B. Perception / 6. Inference in Perception
Perception must be an internal matter, because we can fail to perceive when we are preoccupied [Theophrastus]
26. Natural Theory / A. Speculations on Nature / 2. Natural Purpose / a. Final purpose
Diogenes of Apollonia offered the first teleological account of cosmology [Robinson,TM]
26. Natural Theory / A. Speculations on Nature / 6. Early Matter Theories / c. Ultimate substances
Air is divine, because it is in and around everything, and arranges everything
Everything is ultimately a variation of one underlying thing
26. Natural Theory / A. Speculations on Nature / 6. Early Matter Theories / f. Ancient elements
Plants and animals can only come into existence if something fixes their species
Things must retain their essential nature during change, or mixing would be impossible