# Emacs: Xah Math Input Mode (xah-math-input.el)

`xah-math-input.el`

is a emacs minor mode for inputting math symbols, emoji, or any Unicode characters.

## Get it by Donation

Goto paypal.com, send $32 to Xah@XahLee.org (be sure to include your correct email address. I need that to send it to you.)

Write in message area: xah-math-input.el

## How to Use

`Alt`+`x``global-xah-math-input-mode`

- Toggle on/off for all buffers.
`Alt`+`x``xah-math-input-mode`

- Toggle on/off for current buffer.

In lisp code for your emacs init file:

(global-xah-math-input-mode 1) ; turn on globally (global-xah-math-input-mode 0) ; turn off globally

Type `inf`

, then press `Shift`+`Space`, then it becomes ∞.

- a → α
- b → β
- p → π
- l → λ
- g → γ
- G → Γ
- sum → ∑
- prod → ∏
- cp → ⊕
- rt → √
- and → ∧
- && → ∧
- ne → ≠
- != → ≠
- /= → ≠
- ge → ≥
- >= → ≥
- to → ⇒
- => → ⇒
- -> → →
- R2 → ℝ²
- s2 → ²
- sup2 → ²
- ^2 → ²
- _i → ᵢ
- e' → é
- e` → è
- e" → ë
- e^ → ê
- n~ → ñ
- deg → °
- heart → ♥

For the complete up-to-date list, `Alt`+`x` `xah-math-input-list-math-symbols`

The mode supports over 600 unique symbols, and you can add your own. Any unicode character, including emoji.

### XML Abbreviations

All XML character entity abbrevs are supported. For example

`copy`

→ ©

[see HTML XML Entities]

### Mathematica Abbrev

Most Mathematica's abbreviation is also supported. For example:

`es`

→ ∅

### Unicode by Decimal Number

Unicode by decimal can be entered like this:

`945`

→ α

(Note: alpha has abbrev of “a”. All Greek Alphabet has single letter abbrev.)

[see Unicode: Greek Alphabet α β γ δ ε ζ η]

### Unicode by Hexadecimal

Unicode by hexadecimal can be entered like this:

`x3b1`

→ α`u+3b1`

→ α

## Customization

### Change Activation Key

To change the activation key, put this in your Emacs Init File:

(require 'xah-math-input) (define-key xah-math-input-keymap (kbd "S-SPC") nil) ; unset Shift+space (define-key xah-math-input-keymap (kbd "<f8>") 'xah-math-input-change-to-symbol)

### Add Abbrev, Add Symbol

To add/change a abbrev, Put this in your Emacs Init File:

(require 'xah-math-input) (puthash "floral" "❦" xah-math-input-abrvs)

To find symbols, use Unicode Search 😄.

## Get Unicode Font

For best result, you'll need a font that support Unicode. I recommend DejaVu Sans Mono. [see Best Unicode Fonts for Programer]

xah-math-input.el was named xmsi-mode.el