EN
affirming the consequent Affirmation of the consequent Fallacy of the Consequent affirming the consequence Assuming the consequent
EN
In propositional logic, affirming the consequent, sometimes called converse error, fallacy of the converse, or confusion of necessity and sufficiency, is a formal fallacy of taking a true conditional statement under certain assumptions, and invalidly inferring its converse, even though that statement may not be true under the same assumptions.
Wikipedia
