I want to write some text including sequences like
 in an org-mode text file, but this is automatically turned into a footnote reference. This plain numeric footnote is not recommended anyway. How can I turn off this footnote reference type completely?
There's an answer on the Unix SE based on this thread from 2010, but the solution doesn't work: with
#+DISABLE_PLAIN_FOOTNOTES: some arbitrary text in the org file the footnote reference is still created in the buffer.
I'm not sure if this configuration is supposed to depend on the custom .emacs function, but adding that returns an warning:
Warning (initialization): An error occurred while loading `~/.emacs.d/init.el': Symbol's value as variable is void: org-export-inbuffer-options-extra
Can the plain numeric footnote reference type be disabled?