Affirming the consequent, sometimes called converse error, is a formal fallacy, committed by reasoning in the form:
- If P, then Q.
- Q.
- 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 only sufficient 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.
Read more about Affirming The Consequent: Examples
Famous quotes containing the words affirming the, affirming and/or consequent:
“A large part of the popularity and persuasiveness of psychology comes from its being a sublimated spiritualism: a secular, ostensibly scientific way of affirming the primacy of “spirit” over matter.”
—Susan Sontag (b. 1933)
“The dissident does not operate in the realm of genuine power at all. He is not seeking power. He has no desire for office and does not gather votes. He does not attempt to charm the public, he offers nothing and promises nothing. He can offer, if anything, only his own skin—and he offers it solely because he has no other way of affirming the truth he stands for. His actions simply articulate his dignity as a citizen, regardless of the cost.”
—Václav Havel (b. 1936)
“... the prevalent custom of educating young women only for marriage, and not for the duties and responsibilities consequent on marriage—only for appendages and dead weights to husbands—of bringing them up without an occupation, profession, or employment, and thus leaving them dependent on anyone but themselves—is an enormous evil, and an unpardonable sin.”
—Harriot K. Hunt (1805–1875)