单词	open interval
释义	Open Interval An interval that does not include the end points. Example: the interval (0,20) is all the numbers between 0 and 20, but not 0 or 20. Could also be written 0 < x < 20 Imagine a company only accepts a package "less than 20 kg", so 20 kg is not included, nor is 0 kg because that is not a package: so 0 < package < 20 kg See: Closed Interval
随便看	semi-major axis semi-minor axis semiannually semicircle semiprime senary sentence septagon septenary sequence series set sexagesimal shape sharing si units side side view sign signed number significant digits similar simple harmonic motion simple interest simplest form (algebra)

数学辞典收录了1200条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。