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
President's rule obtaining the consent of the President of India. If it is not possible to revoke Governor's rule within six months of imposition, the President's Rule under Article 356 of the Indian Constitution is imposed. There is little practical difference between the two provisions. Following its landmark judgment in the 1994 "Bommai" case, the Supreme Court of India has restricted arbitrary impositions of President's rule. Chhattisgarh and Telangana are the only states where President's rule has yet to be imposed. In practice, president's rule has been imposed under different circumstances: If approved by both houses, President's Rule can continue for 6