Affirming a disjunct

What it is

Reasons "A or B; A; therefore not B", treating an inclusive "or" as if it were exclusive.

Related

• Affirming the consequent fallacy
  Both are formal fallacies where the conclusion seems to follow but does not.
• Wason selection task bias
  Everyday "or" and "if" statements are often misread, which simple-logic puzzles expose.

References

• Wikipedia: Affirming a disjunct en.wikipedia.org
• Internet Encyclopedia of Philosophy: Fallacies iep.utm.edu
• Stanford Encyclopedia of Philosophy: Fallacies plato.stanford.edu
• Wikipedia: List of fallacies en.wikipedia.org
• Purdue OWL: Logical fallacies owl.purdue.edu

More in “Invalid logical form”