Questions tagged [principle-of-non-contradiction]
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8
questions
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2answers
113 views
How to understand a proof by contradiction in minute detail?
I am following the course "Language, Proof, and Logic" from Stanford on EdX. I am trying to understand proof by contradiction specifically. I understand the gist of this type of proof, and I ...
4
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3answers
352 views
Can a category of non-difference exist in Western logic?
Indian philosophy has a logical category of non-difference (related somewhat to abheda) in which something is different from something else but identical to it as well. An example is that of the the ...
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vote
1answer
48 views
Relationship between Principle of sufficient reason and Law of identity [closed]
I have an intuition that one can derive the principle of sufficient reason from the law of identity or non-contradiction but i don't know how.
If someone knows I'd like some help.
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12answers
11k views
Why is it that the statement "All goblins are yellow" does not contradict the statement "All goblins are pink?"
From what I know, I think it has something to do with vacuous truths, but my understanding is not quite there yet.
1
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3answers
110 views
Why law of identity is formulated in terms of "things" and not statements?
The law of non-contradiction (LNC) and law of excluded middle (LEM) are both formulated in terms of statements. That is "A and not A" is always false and "A or not A" is always ...
2
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4answers
345 views
Can we know that law of non contradiction is true a priori?
I have seen some arguments for why should we accept law of non contradiction, and it seems to works in almost all areas. But some argument for it is like an argument for principle "nothing comes from ...
5
votes
4answers
284 views
Where did Suárez say the principle of non-contradiction does not apply to the Trinity?
Fr. Réginald Garrigou-Lagrange, O.P., says, in Le Sens du Mystère et le Clair-Obscur Intellectuel: Nature et Surnaturel p. 128 fn. 1 (Engl. transl. p. 142 fn. 41):
St. Thomas never would have ...
4
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3answers
496 views
How do Thomists prove that: "Everything that exists must exist by something."?
One variation of principle of sufficient reason that Thomists use is:
Everything that exists must exist by something.
How do they prove such a statement? In particular, why can not something just ...
