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
Equal authenticity rule be printed and published in both those Languages [i.e. both English and French]." The rule requires courts to treat "both [the English and French] versions of statutes [as] equally valid and authoritative interpretations of the law," The rule holds that both versions are equally authoritative even if the statute in question was clearly drafted in one language and translated into the other, and even if the two versions of the law are incompatible. An early version of the principle may be found a statute of the Parliament of the Province of Canada, enacted in 1857. The "Act respecting the Codification