Uncertainty relations in the product form

We study the uncertainty relation in the product form of variances and obtain some new uncertainty relations with weight, which are shown to be tighter than those derived from the Cauchy–Schwarz inequality.     

2~2p~3阶群的构造

设G是2~2p~3阶群,S_2,S_p分别为G之sylow 2-群与sylow p-群,由于p≠3,S_pΔG,且S_p∩S_2=1,G=S_2S_p由ο(S_2)=4,知S_2或为循环群或为初等交换群,由ο(S_p)=p~3(p≠2),推出共有五种类型的群。 1.S_p=(?)Z_p, 由群之扩展理论,容易得到如下5个群:     

ADDENDUM TO“THE STRUCTURES OF GROUPS OF ORDER 2~3p~2n

The present paper is a complement to the paper[1].It is proved that groups oforder 2~37~2 have 44 types.     

Geometric global quantum discord of two-qubit states

We consider the geometric global quantum discord(GGQD) of two-qubit systems. By analyzing the symmetry of geometric global quantum discord we give an approach for deriving analytical formulae of the extremum problem which lies at the core of computing the GGQD for arbitrary two-qubit states. Furthermore, formulae of GGQD of arbitrary two-qubit states and some concrete examples are presented.