The hardest step to solve Hilbert’s tenth problem is to prove that the exponential rela-tion is Diophantine. In the stu......

采用文献资料调研，现场观察和录相统计方法，对全国第10届运动会双人花样滑冰比赛进行分析，提出我国双人花样滑冰目前所处的位置和存在......

Xu Jialu,Vice Chairman of the Ninth and the Tenth Standing Committee of the National People’s Congress, is also a world......