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The 6 different faces of the Cube are called U(p), D(own), R(ight), L(eft), F(ront) and B(ack). While U denotes an Up Face quarter turn of 90 degrees clockwise, U2 denotes a 180 degrees turn and U' denotes a quarter turn of 90 degrees counter-clockwise. A sequence like U D R' D2 of Cube moves is called a maneuver.
(3阶)魔方的六个面我们分别叫U(上),D(下),R(右),L(左),F(前) 和B(后). U的意思就是把'上'面顺时针旋转90度.而U2的意思是把'上'面顺时针旋转180度.U'的意思是把'上'面逆时针旋转90度. 一个移动序列如 U D R' D2 ,我们称之为一个'步法'.
If you turn the faces of a solved cube and do not use the moves R, R', L, L', F, F', B and B' you will only generate a subset of all possible cubes. This subset is denoted by G1 = <U,D,R2,L2,F2,B2>. In this subset, the orientations of the corners and edges cannot be changed. That is, the orientation of an edge or corner at a certain location is always the same. And the four edges in the UD-slice (between the U-face and D-face) stay isolated in that slice.
如果你在拧魔方的时候不使用R, R', L, L', F, F', B和B',那么会生成一个状态子集.这个子集我们用G1=<U,D,R2,L2,F2,B2>表示.在这个子集里面,角块和边块的方向是不会改变的(这点在盲拧中我们也可以体会到,译者注).那就是说,对于 |
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