once use the command below:
C-x RET C-\ TeX RET
I try to make some math formula:
but it can't be automatic translated to √,
then I check the symbol list:
and also can't find the \sqrt tex item,
so is there a config I have missed?
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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,
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).
Bug report submitted to https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25594 ...