Method: Copy the command below and paste it into mathtype.
\mathcal{L}
Note:
1. You can only copy and paste text, and it is invalid to enter it yourself. The letter L inside can be modified, such as changing to \mathcal{A}
Effect:
2. It is recommended to type a few letters in the formula before pasting , because the format of the current position will be changed after pasting the command. If you enter this symbol immediately, the content of the keyboard input may be a blank character. At this time, you can move the cursor to the next position, as long as it is not next to the instruction symbol, you can input normally.