Posted: Jan 26, 2015 7:19 pm
by Calilasseia
hackenslash wrote:
TopCat wrote:
hackenslash wrote:It would be wrong to dismiss his conclusion, because that commits a fallacy all its own

Sorry, I don't get that, could you explain please?

The only reason for not dismissing the conclusion I can see would be that it could be right, based on some other, unstated, non-fallacious argument. Is that anywhere close?


Pretty much. To dismiss a conclusion based on the fact that a fallacy has been committed in arriving at it is to commit the fallacist's fallacy.

E.g:

P1. All yellow things are made of mostly hydrogen and helium.
P2. The sun is yellow.
C. The sun is made of mostly hydrogen and helium.

The conclusion is correct, but the reasoning employed to arrive at it incorrect, thus to dismiss the conclusion, which is true, based on the fact that the reasoning is incorrect, is to commit the fallacist's fallacy.


Which of course dovetails nicely with the fact that the material conditional sensu Quine, is true when the antecedent is false, but the consequent is true. Reflecting the fact that one can alight upon a true conclusion by faulty means, but one cannot consistently alight upon a falsehood by error-free derivation from a true antecedent.

And after that tangential diversion into the world of propositional logic, I return you all to your scheduled thread. :)