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 by decree is the sign of a "generalization of the state of exception". Rule by decree Rule by decree is a style of governance allowing quick, unchallenged creation of law by a single person or group, and is used primarily by dictators, absolute monarchs and military leaders. The expression is also sometimes used when describing actions of democratic governments that are perceived to unduly bypass parliamentarian or popular scrutiny. Rule by decree allows the ruler to arbitrarily create law, without approval by a legislative assembly. When states of emergency such as martial law are in place, rule by decree is common. While