兔子换窝

目的:培养灵活果断的判断能力,提高兴奋性。场地设置:平坦空地一块。方法:参加游戏者手拉手围成一个圆形后,每3人一组,两边向中间的人靠拢。两边的人面对面站立相互拉手做成圆形兔窝,围住中间的人,中间的人为“家兔”钻进窝中,剩下不足6人站在场地中间充当“野兔”。听到换窝的信号后,“家兔”必须出窝另寻一个窝,“野兔”在此时乘机寻空窝成为“家兔”,没有找到窝的变成“野兔”,在场地中央表演节目,尔后游戏重新开始。每当游戏进行二次后,充当“家兔”

An Anyon Model in a Toric Honeycomb Lattice

We study an anyon model in a toric honeycomb lattice. The ground states and the low-lying excitations coincide with those of Kitaev toric code model and then the excitations obey mutual semionic statistics. This model is helpful to understand the toric code of anyons in a more symmetric way. On the other hand, there is a direct relation between this toric honeycomb model and a boundary coupled Ising chain array in a square lattice via Jordan-Wigner transformation. We discuss the equivalence between these two models in the low-lying sector and realize these anyon excitations in a conventional fermion system. The analysis for the ground state degeneracy in the last section can also be thought of as a complementarity of our previous work [Phys. A： Math. Theor. 43 （2010） 105306].

野钓话“窝”

野钓时如能找好“窝子”，就能多钓鱼。但要是找对之后却对“窝”的喂、投、换、挪、补几方面没做好，优势也就不“优”了。如何把握好这五种关系，笔者的认识和做法是：