FORMAL FAL By N., Pam M.S. - May 11, 2013 a term used when involving a violation of a principle that is in formal logic. It is either affirming the consequent or denying the antecedent. It is a mistaken idea. FORMAL FAL: "A formal fallacy is a mistaken idea." Related Psychology Terms DENYING THE ANTECEDENT DENYING THE CONSEQUENT CONDITIONAL REASONING ANTECEDENT ARISTOTELIAN BIVALENCE FORMAL REASONING EXCLUDED MIDDLE PRINCIPLE DISPLAY-CONTROL COMPATIBILITY EVALUATIVE REASONING Cite this page: N., Pam M.S., "FORMAL FAL," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/formal-fallacy/ (accessed August 8, 2020).