Vim keymap to type Unicode math symbols using TeX input sequences. The mapping is from unicode-math via astoff/unicode-math-input.el.

Install with a package manager such as Vundle.

Set the keymap:

:set keymap=unicode-math

Then start typing a TeX command such as e.g. \alpha. After the leading \, you should see that the cursor does not advance until the α character is produced.

For a more convenient way to turn the keymap on and off, add the following lines to your .vimrc:

set keymap=unicode-math
set iminsert=0
set imsearch=-1

You can then toggle the unicode-math keymap by pressing <C-6> in insert mode.

See the unicode-math symbol list for a list of symbols with explanations. The keymap contains a number of additions:

• standard math commands: \ldots, \cdots

• standard TeX commands: \S

• superscripts: ^1, ^2, etc. where available

• subscripts: _1, _2, etc. where available

• Greek superscripts: ^\beta, ^\gamma,^\delta ,^\phi, ^\chi

• Greek subscripts: _\beta, _\gamma,_\delta ,_\phi, _\chi

• Eth: \eth, \dh, \DH

• faux superscripts and subscripts from combining characters with space: ^*, _*, _,

• clockwise contour integral alias: \ointclockwise

• combining ring overlays for large contour integrals: \ointring, \ointringclockwise, \ointringctrclockwise

  ⌠    ⌠    ⌠
  ⎮⃘    ⎮⃙    ⎮⃚
  ⌡    ⌡    ⌡
  

Note that many TeX accents correspond to Unicode combining characters that go after the symbol. To produce e.g. x̄, you need to type x\bar.