Re: Is it a paradox? (fwd)
- From: "Michael De" <mikejde@xxxxxxxxx>
- Date: 14 Jul 2005 20:30:15 -0700
Reinhold Friedrich Burger wrote:
> Consider the following line of reasoning. Let p be the proposition
> "Ronald was born in New York." From p, we can infer q: Ronald was born
> in the United States. From q, we can infer r: It is possible that
> Ronald was born in New Jersey. On the other hand, from p we can infer
> s: It is not possible that Ronald was born in New Jersey. We have
> arrived at a contradiction. What is wrong? Note: To answer the
> question, familiarity with modal logic is not needed.
This commits a fallacy that Aristotle noticed in De Interpretatione.
>>From p you can't infer ~<>(Ronald was born in NJ), you can only infer
that <>~(Ronald was born in NJ), and that is not incompatible with
<>(Ronald was born in NJ).
.
- References:
- Is it a paradox? (fwd)
- From: Reinhold Friedrich Burger
- Is it a paradox? (fwd)
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