\usepackage{savesym}
\usepackage{amsmath, amsfonts, amsthm, amssymb}
\savesymbol{iint}
\usepackage{txfonts} % this is the font
\restoresymbol{TXF}{iint}
\usepackage{ucs}
\usepackage[ansinew]{inputenc}
\usepackage{textcomp}
笔记！现在需要 savesym 包来避免错误，因为 iint 已经定义了。
问候， 奥瓦内斯
Ok, I got it. Changing to font which has this sign solved the issue.
\usepackage{savesym}
\usepackage{amsmath, amsfonts, amsthm, amssymb}
\savesymbol{iint}
\usepackage{txfonts} % this is the font
\restoresymbol{TXF}{iint}
\usepackage{ucs}
\usepackage[ansinew]{inputenc}
\usepackage{textcomp}
Note! savesym package is now needed to avoid errors, that iint is already defined.
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评论（3）
如果您想避免更改字体的麻烦（例如，您想保留时间），请尝试以下操作：
If you want to avoid the bother of changing fonts (for example, you want to keep times), try this:
好的，我明白了。更改为带有此标志的字体解决了该问题。
笔记！现在需要 savesym 包来避免错误，因为 iint 已经定义了。
问候，
奥瓦内斯
Ok, I got it. Changing to font which has this sign solved the issue.
Note! savesym package is now needed to avoid errors, that iint is already defined.
Regards,
Ovanes
这对我有用：（
取自 这里)
this worked for me:
(taken from here)