摘要：
From the perspective of analytical geometry, an interval is composed of infinitely many points, while after the length of an interval was defined, it is intuitively to believe its length is the sum of... 阅读全文
摘要：
Dividing an unit interval $[0,1]$ into two equal subintervals by the midpoint $\dfrac {0+1} {2}=\dfrac {1} {2}$, denote the left subinterval by $I_{1} 阅读全文
