2

once use the command below:

C-x RET C-\ TeX RET

I try to make some math formula:

\sqrt{}

but it can't be automatic translated to √, then I check the symbol list:C-h I and also can't find the \sqrt tex item, so is there a config I have missed?

1

No, you're not missing anything. For whatever reason, the TeX input method doesn't include include the macro \sqrt. You can get that symbol under its secret name, \surd.

This is arguably a bug which could be fixed by inserting a rule for \sqrt in the latin-ltx--define-rules form in the file leim/quail/latin-ltx.el. I don't follow that macro, but it would probably also be possible to add the rule in your config if you knew the name of the appropriate variable (which I don't as of yet).

Update

Bug report submitted to https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25594 ...

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