I fully understand the advantage of semantic editing introduced in TeXmacs. However, the space introduced between variables by pressing the multiplication button (e.g., a*b) looks quite annoying. After searching with Google, I find there should be (or probably there was) an option to disable semantic editing. Where is the option in the recent versions of TeXmacs?

# Is it possible to disable semantic editing for math?

For semantic editing, it seems the section 7 of http://www.texmacs.org/tmweb/manual/webman-math.en.html is outdated.

Actually, you may write math with ill-semantics, but you may use TeXmacs to correct the semantics automatically.

And what is actually the annoying part? The display of invisible multiplication as a space? Or the input of the invisible multiplication?

Thank you for the reply. I have been using TeXmacs for 2 years and I certainly understand how to type math expressions and do semantic editing.

The display of invisible multiplications as spaces is annoying. I donâ€™t really mind pressing the * button to help TeXmacs understand that I am doing a multiplication.

There is an answer on this in the mailing list (I advertised your post there), you can read it in the mailing list archives at https://lists.texmacs.org/wws/arc/texmacs-users/2019-12/msg00030.html

Thank you. This is exactly what I wanted.

There are so many undocumented packages and probably only the developers know how to use them.