Inserting unicode symbol for rational numbers ℚ using TeX input method

Question

Hello good people of Emacs!

To insert unicode math symbols I use TeX input method. This way I get unicode character ℝ by typing \Bbb{R}, ℕ by typing \Bbb{N}, ℤ by typing \Bbb{Z}, etc...

I'm unable to get symbol ℚ, since typing \Bbb{Q} does not insert unicode character.

Any Ideas what can be the source of this error?

Answer 1

The character set used is in the ISO 10646 encoding, which includes the following double stroked letters

C H N P Q R Z

and no others. Unfortunately the TeX input method only defines shortcuts for

N P R Z

as describe-input-encoding will tell you. However, How can I add characters to an input method? shows you how to add extra sequences to this input encoding. Thus all you need to know is that double stroked Q is at code point 211A to add this character. To find the code points for other characters have a look at the ISO 10646 standard at http://standards.iso.org/ittf/PubliclyAvailableStandards/index.html .