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 ponens of as "double "modus ponens"." The history of "modus ponens" goes back to antiquity. The first to explicitly describe the argument form "modus ponens" was Theophrastus. The "modus ponens" rule may be written in sequent notation as where "P", "Q" and "P" → "Q" are statements (or propositions) in a formal language and ⊢ is a metalogical symbol meaning that "Q" is a syntactic consequence of "P" and "P" → "Q" in some logical system. The argument form has two premises (hypothesis). The first premise is the "if–then" or conditional claim, namely that "P" implies "Q". The second premise is