Ideas from 'Against the Professors (six books)' by Sextus Empiricus [180], by Theme Structure

[found in 'Against the Professors' by Sextus Empiricus (ed/tr Bury,R.G.) [Harvard Loeb 1949,978-0-674-99420-1]].

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3. Truth / A. Truth Problems / 5. Truth Bearers
It is only when we say a proposition that we speak truly or falsely
5. Theory of Logic / E. Structures of Logic / 1. Logical Form
'Man is a rational mortal animal' is equivalent to 'if something is a man, that thing is a rational mortal animal'
14. Science / A. Basis of Science / 1. Observation
How can you investigate without some preconception of your object?
23. Ethics / B. Contract Ethics / 9. Contractualism
Right actions, once done, are those with a reasonable justification
26. Natural Theory / A. Speculations on Nature / 4. Mathematical Nature
The tektraktys (1+2+3+4=10) is the 'fount of ever-flowing nature'