ITERATIVE DISJUNCTIVE SYLLOGISM Basic propositional logic teaches that the disjunctive syllogism (modus tollendo ponens) is a valid argument, in which one of its premises is a disjunction (P v Q), and the other premise is the negation of one of the disjuncts: P v Q ~P­­­_____ ∴ Q See Irving Copi & Carl Cohen Introduction to Logic at 362 (2005). [read post]

According to the EPA, although phosphorus is a naturally-occurring nutrient, “in excess it can cause chemical and biological changes that degrade natural systems, such as wetlands, lakes, and coastal areas. [read post]