There is a negative thinspace \!
which is a negative version of \,
.
Is there a negative version of normal character space \
too?
I could not find it in: Lengths and when to use them, What commands are there for horizontal spacing?, https://mylatexnotes.wordpress.com/2017/05/09/text-negative-white-spaces/
\
could shrink/expand with the text, so it's not fixed.\fontdimen2
but as Werner said that can shrink or stretch (\fontdimen3
and\fontdimen4
) so the space isn't really fixed. Are you by any chance looking for something like\unskip
?