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Steven Pinker and I ( 1989 ) believed that this pattern arose due to the use of mental rotation ( Shepard & Metzler , 1971 ) or a continuous alignment process ( Ullman , 1989 ) to transform unfamiliar viewpoints to familiar views encoded in visual memory ( with familiar viewpoints being recognized with the need for a transformation ) . Other environmental factors influencing protein content are soil type , crop rotations ( especially those that include legumes ) , and use of nitrogen fertilization . The normal rotation ( " drilling rotation " ) is introduced as an auxiliary function for user 's convenience ( discretization by the stabilized method of Hughes and Brezzi ) . Once we have this method of deriving the representations the method can be used to provide analogues of these representations for Iwahori-Hecke algebras of other types . All residents complete additional cardiac emergency training during the cardiology rotation ( " Emergency Response Team Leader Course " ) . They showed that the inclusion of the Hopf algebra of non-commutative symmetric functions in the Malvenuto-Reutenauer Hopf algebra of permutations factors through their Hopf algebra of trees , and these maps correspond to natural maps from the weak order on the symmetric group to the Tamari order on planar binary trees to the boolean algebra . The angle of the blades can be adjusted relative to the plane of rotation ( " pitch " ) , either uniformly for all blades ( " collective pitch " ) , or differentially in a specific orientation relative to the aircraft body ( " cyclic pitch " ) .