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Is there some input method to easily type math symbols UTF8 characters (like U+2200 FOR ALL ∀, U+2203 THERE EXISTS ∃, U+2208 ELEMENT OF ∈, U+2190 LEFTWARDS ARROW ←, etc...)?

I would like to type easily these characters in some <textarea> in Firefox (38 or 42) on Debian/Linux/x86_64 under xfce4 or Gnome (and I want to avoid Javascript tricks for that). I am currently copy/pasting them from some CharacterMap application, which is uneasy.

The answers to this related question requires some ad-hoc configuration; I am asking for a standard input method.

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  • I think compose key + character code is the way to go. You can't possibly have dedicated key, or key combo for that matter, for every unicode characters.
    – Bibek_G
    Jan 6, 2016 at 6:54
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    what do you mean by standard input method?
    – Pandya
    Jan 6, 2016 at 10:02

1 Answer 1

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Try this: press ctrl-shft-U and then type the 4-digit code. This works on my Gnome shell desktop (Fedora 20, though). For example, when I type ctl-shft-U 2203 and then hit the space bar, it gives me ∃ . See http://library.gnome.org/users/gnome-help/stable/tips-specialchars.html.en

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    That could work, but is not very user friendly. I was thinking of some "input mode" (or simply Javascript browser code) which perhaps would allow me to type \forall followed by the escape key, or something similar.
    – Basile Starynkevitch
    Jan 13, 2016 at 17:50

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