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Single Idea 1684

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

Full Idea

There are falsehoods which are contrary to one another and cannot be the case together e.g. that a man is a horse or a cow.

Gist of Idea

Two falsehoods can be contrary to one another

Source

Aristotle (Posterior Analytics [c.327 BCE], 88a29)

Book Ref

Aristotle: 'Posterior Analytics (2nd ed)', ed/tr. Barnes,Jonathan [OUP 1993], p.44


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]