Modus tollens
[ca] Modus tollendo tollens
[cs] Modus tollens
[da] Modus tollens
[de] Modus tollens
[el] Μέθοδος διάψευσης
[es] Modus tollendo tollens
[et] Modus tollens
[eu] Modus tollendo tollens
[fa] نفی تالی
[fr] Modus tollens