[問題] \because 這符號無法使用

作者: Beilan56 (北懶56)   2016-10-05 21:44:53
As title,
想要打出"因為"的數學符號,卻不停失敗..
已經嘗試單獨一行 $\because$ ,依舊無法成功,但是刪除\because後,
內容是可以成功編輯的。
如圖所示:http://imgur.com/YMRABXu
然後複製了下方錯誤碼,google之後還是不知如何解決問題
附上錯誤碼:
$\because $ The control sequence at the end of the top line of your error
message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type
`I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and
I'll forget about whatever was undefined.
請問該從哪邊去改善這問題呢...QQ
作者: LPH66 (-6.2598534e+18f)   2016-10-05 21:54:00
\usepackage{amssymb} 有加嗎?
作者: JamesChen (James)   2016-10-06 03:53:00
他解釋啦 你沒有定義過 \because

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