C. Northcote Parkinson C. Northcote Parkinson Cyril Northcote Parkinson (30 July 1909 – 9 March 1993) was a British naval historian and author of some 60 books, the most famous of which was his best-seller "Parkinson's Law" (1957), in which Parkinson advanced Parkinson's law, stating that "work expands so as to fill the time available for its completion", an insight which led him to be regarded as an important scholar in public administration and management. The youngest son of William Edward Parkinson (1871–1927), an art master at North East County School and from 1913 principal of York School of Arts and Crafts, and
Law of noncontradiction Law of noncontradiction In classical logic, the law of non-contradiction (LNC) (also known as the law of contradiction, principle of non-contradiction (PNC), or the principle of contradiction) states that contradictory statements cannot both be true in the same sense at the same time, e.g. the two propositions ""A is B"" and ""A is not B"" are mutually exclusive. It is the second of the three classic laws of thought. The principle was stated as a theorem of propositional logic by Russell and Whitehead in "Principia Mathematica" as: The law of non-contradiction, along with its complement, the law of excluded middle