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Single Idea 1708

[filed under theme 2. Reason / B. Laws of Thought / 4. Contraries ]

Full Idea

Take, for example, "Callias is just", "Callias is not just", and "Callias is unjust"; which of these are contraries?

Gist of Idea

In "Callias is just/not just/unjust", which of these are contraries?

Source

Aristotle (On Interpretation [c.330 BCE], 23a31)

Book Ref

Aristotle: 'Categories and De Interpretatione', ed/tr. Ackrill,J.R. [OUP 1963], p.65


The 9 ideas with the same theme [could both be false, but can't both be true]:

Only one thing can be contrary to something [Plato]
The contrary of good is bad, but the contrary of bad is either good or another evil [Aristotle]
Both sides of contraries need not exist (as health without sickness, white without black) [Aristotle]
From one thing alone we can infer its contrary [Aristotle]
Contraries are by definition as far distant as possible from one another [Aristotle]
In "Callias is just/not just/unjust", which of these are contraries? [Aristotle]
There is no middle ground in contradiction, but there is in contrariety [Aristotle]
Two falsehoods can be contrary to one another [Aristotle]
Contrary pairs entail contradictions; one member entails negation of the other [Lipton]