I can't really stand it when Tom discusses atheism/agnosticism

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Quote Antifascist:

Dr. Econ wrote:

...a logical statement might be like this:

1) If A then B
2) Here is B, therefore A

Not, A is B because I said so.

Dr. Econ, you just committed the formal logical deductive fallacy known in baby logic as "Affirming The Consequence."

  1. If P, then Q.
  2. Q.
  3. Therefore, P.

An argument of this form is invalid, i.e., the conclusion can be false even when statements 1 and 2 are true. Since P was never asserted as the onlysufficient condition for Q, other factors could account for Q (while P was false).

The name affirming the consequent derives from the premise Q, which affirms the "then" clause of the conditional premise.

Uh, I got it backwards. Anyway, it doesn't matter. The point I am making is that the previous post quote was simply illogical

Dr. Econ's picture
Dr. Econ
Jul. 31, 2007 4:01 pm