运算符
You can choose among various operators to structure your LibreOffice Math formula. All available operators appear in the lower part of the Elements pane. They are also listed in the context menu of the Commands window. All operators not contained in the Elements pane or in the context menu must be typed manually in the Commands window.
The following is a list of the available operators. An icon next to the operator name indicates that it can be accessed through the Elements pane (choose View - Elements) or through the context menu of the Commands window.
运算符函数
上限和下限
为积分和求和插入带有一个占位符的上限和下限范围声明。您也可以在命令窗口中直接输入 from{<?>} to{<?>} <?>。限制语句必须与正确的运算符相结合。这些限制项将居于求和字符上方/下方的中央位置。
通过首先单击所需的运算符,然后再单击限制符号,您可以向运算符中添加限制条件(例如,积分)。此方式比直接键入命令的方式更快捷。
命令 liminf 会插入带有一个占位符的下极限。
命令 limsup 会插入带有一个占位符的上极限。
By typing oper in the Commands window, you can insert user-defined operators in LibreOffice Math, a feature useful for incorporating special characters into a formula. An example is oper %theta x. Using the oper command, you can also insert characters not in the default LibreOffice character set. oper can also be used in connection with limits; for example, oper %union from {i=1} to n x_{i}. In this example, the union symbol is indicated by the name union. However, this is not one of the predefined symbols. To define it, choose Tools - Symbols. select Special as the symbol set in the dialog that appears, then click the Edit button. In the next dialog, select Special as the symbol set again. Enter a meaningful name in the Symbol text box, for example, "union" and then click the union symbol in the set of symbols. Click Add and then OK. Click Close to close the Symbols dialog. You are now finished and can type the union symbol in the Commands window, by entering oper %union.
当您在命令窗口中手动输入时要注意,对于很多运算符来说,空格符对于保证结构的正确是必不可少的。当您在运算符中加上数值而不是占位符时,尤其要注意,例如:lim a_{n}=a。