History Main / TwoNegativePremises

7th Jul '12 4:41:28 PM Madrugada
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Well, how about:
--> No crow is a stone.
--> No stone has wings.
--> Therefore, crows have wings.
* that's called a [[FallacyFallacy Fallacy Fallacy]]

Which could just as easily be:
--> No dog is a stone.
--> No stone has wings.
--> Therefore, dogs have wings.
23rd Feb '12 1:22:01 AM stenlis
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to:

* that's called a [[FallacyFallacy Fallacy Fallacy]]
23rd Oct '11 11:48:10 PM 11cookeaw1
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Added DiffLines:

--> No dogs are reptiles.
--> No reptiles shoot lasers out of their eyes.
--> Dogs shoot lasers out of their eyes.
28th Jun '11 7:31:32 PM Madrugada
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:: If A is not B, and B is not C, then A is C. This is always invalid logic (although it may happen to be true), as it is not possible to make a valid conclusion from two negative premises; logic is not arithmetic.

to:

:: If A is not B, and B is not C, then A is C. This is always invalid logic (although it may happen to be true), as it is not possible to make a valid conclusion from two negative premises; logic is not arithmetic.
arithmetic. This is a fallacy because simply identifying what something ''isn't'' doesn't identify what it ''is''.
26th Nov '10 7:31:51 PM Naganonamy
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--> Therefore, crows have wings.

to:

--> Therefore, crows have wings.

Which could just as easily be:
--> No dog is a stone.
--> No stone has wings.
--> Therefore, dogs have
wings.
22nd Nov '10 7:00:37 AM apai
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--> Dogs are magenta.

to:

--> Dogs are magenta.magenta.

Well, how about:
--> No crow is a stone.
--> No stone has wings.
--> Therefore, crows have wings.
30th Oct '10 9:50:39 AM PhoenixFire
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:: If A is not B, and B is not C, then A is C. This is always invalid logic (although it may happen to be true), it is not possible to make a valid conclusion from two negative premises, logic is not arithmetic.

to:

:: If A is not B, and B is not C, then A is C. This is always invalid logic (although it may happen to be true), as it is not possible to make a valid conclusion from two negative premises, premises; logic is not arithmetic.
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http://tvtropes.org/pmwiki/article_history.php?article=Main.TwoNegativePremises