时间序列中引出的数学问题

A MATHEMATICAL PROBLEM FROM THE TIME SERIES

ｘ＇＝（ｘ＿１，ｘ＿２，…ｘ＿ｎ）是ｎ维欧氏空间矢量，问在≤１条件下ａ＿３＝ａ＿ｓ＝当Ｘ取遍≤１上的点，（ａ＿３，ａ＿５）在平面上构成怎样的图形？本文对ｎ＝３，４的情况给出了结果，对ｎ趋于无穷情况，作出了猜想．

Suppose X'=(X_1,X_2,…,X_n)is a vector on n-dimensional Euclid Space。Under the condition of,When x covers all thepointss in What is the graqph that(a_3,a_5)compose on the plane? The result isachieved when n=3.4 and the conjecture is had when n approximaces to infinity.