A method of writing proofs is described that makes it harder to prove things that are not true. The method, based on hierarchical structuring, is simple and practical. The author's twenty years of experience writing such proofs is discussed.
机构:
Harvard Univ, Harvard Med Sch, Brigham & Womens Hosp, Div Global Hlth Equ, Cambridge, MA 02138 USAUniv Sydney, Sydney Sch Publ Hlth, Sydney, NSW, Australia