Modus vivendi Modus vivendi Modus vivendi is a Latin phrase that means "mode of living" or “way of life”. It often is used to mean an arrangement or agreement that allows conflicting parties to coexist in peace. In science it is used to describe lifestyles. "Modus" means "mode", "way", "method", or "manner". "Vivendi" means "of living". The phrase is often used to describe informal and temporary arrangements in political affairs. For example, if two sides reach a "modus vivendi" regarding disputed territories, despite political, historical or cultural incompatibilities, an accommodation of their respective differences is established for the sake of contingency. In
Modus tollens Modus tollens In propositional logic, modus tollens (; MT; also modus tollendo tollens (Latin for "mode that denies by denying") or denying the consequent) is a valid argument form and a rule of inference. It is an application of the general truth that if a statement is true, then so is its contra-positive. The inference rule "modus tollens" validates the inference from formula_1 implies formula_2 and the contradictory of formula_2 to the contradictory of formula_1. The "modus tollens" rule can be stated formally as: where formula_6 stands for the statement "P implies Q". formula_7 stands for "it is not the