Structural rule A famous structural rule is known as cut. Considerable effort is spent by proof theorists in showing that cut rules are superfluous in various logics. More precisely, what is shown is that cut is only (in a sense) a tool for abbreviating proofs, and does not add to the theorems that can be proved. The successful 'removal' of cut rules, known as "cut elimination", is directly related to the philosophy of "computation as normalization" (see Curry–Howard correspondence); it often gives a good indication of the complexity of deciding a given logic. Structural rule In proof theory, a structural rule is
Rule Wynn and Rule Rule Wynn and Rule Rule Wynn and Rule was an Albertan architectural firm that had offices in Calgary and Edmonton. The firm is noted for its prominent role in bringing modern architecture to Alberta. Founded by John Ulric Rule (1904-1978) and Gordon K. Wynn (1910-1994) in Edmonton in 1938, they were joined a year later by Rule's brother, Peter Leitch Rule (1913-1964). The initial partnership came about as neither Rule nor Wynn could find work. All three partners were graduates of the school of architecture at the University of Alberta. During World War II the Rule brothers's father, also named