Entering Symbols, Characters and Mathematical Objects

To Press
Toggle math/text Ctrl+m or Ctrl+t

To enter this Press
mathematical object  
Fraction Ctrl+f or Ctrl+/ or Ctrl+1
Radical Ctrl+r or Ctrl+2
Superscript Ctrl+h or Ctrl+ up arrow or Ctrl+3
Subscript Ctrl+l or Ctrl+down arrow or Ctrl+4
Integral Ctrl+i or Ctrl+8
Summation Ctrl+7
Brackets Ctrl+9 or Ctrl+0 or Ctrl+( or Ctrl+)
Square brackets Ctrl+&lsqb#lbrack; or Ctrl+&rsqb#rbrack; or Ctrl+6
Braces Ctrl+{ or Ctrl+}
Display Ctrl+d
2x2 matrix Ctrl+a
Product Ctrl+p
Absolute value Ctrl+|
Thin space Ctrl+spacebar
Thick space Shift+spacebar
Em space Ctrl+Shift+spacebar
`` (open quote) Single open quote (`) two times
– (en dash) Hyphen (-) two times
— (em dash) Hyphen (-) three times
\textquestiondown ? followed by `
\textexclamdown ! followed by `

To enter this accent Press
$\hat{{a}}$ Ctrl + ∧
$\tilde{{a}}$ Ctrl + ∼
$\acute{{a}}$         Ctrl + ' (open single quote)
$\grave{{a}}$         Ctrl + ` (close single quote)
$\dot{{a}}$         Ctrl + .
$\ddot{{a}}$ Ctrl + ''
$\bar{{a}}$ Ctrl + =
$\vec{{a}}\,$ Ctrl + -