two spin-12 atoms 自旋为1
A permutation group approach to a one dimensional Heisenberg open spin 12 chain with nearest neighbor interactions is studied.
利用置换群方法研究了具有邻近相互作用的一维海森堡自旋12开链模型。
From 12 feet, you'll throw a full-spin rotation. Grab the knife by the handle, as you would a hammer, but keep your thumb along the top edge for stability and to prevent over-rotation.
你得从12英尺外让刀旋转着飞出去，所以你要像握锤子一样握住刀把，并且让拇指顺着刀刃的方向以保持平衡、防止刀转过头。
MINUSES: the rotation is not perfectly even, the nose exits short of 12:00 straight up, and a fair amount of altitude is lost in the spin.
缺点：平转不够平衡，结束时机头不到12：00垂直向上，平转的过程丢失了相当数量的高度。
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