Entering Input in Notebooks
The Wolfram System's notebook interface is a very powerful typesetting system that allows you to enter formulas as they are written in mathematical literature, using two-dimensional notation such as superscripts, subscripts, and so on.
Mathematical symbols and two-dimensional notation can be entered from the keyboard as well as through palettes.
x Ctrl+^ 3
x Ctrl+/ 3
x Ctrl+_ 3
move cursor out of formula by one level
Ctrl + Space
You can use Ctrl+6 as an alternative to Ctrl+^; on some non-U.S. keyboards, you may have to use Ctrl+6.
Note that on some operating systems, if the main Ctrl key is remapped, the keyboard commands discussed here will not work.
Similarly, type +, then the numerator of the fraction, 1, then Ctrl+/ to create the placeholder for the denominator.
Tables and matrices can be entered using the command Insert ▶ Table/Matrix. In the dialog box, specify the number of rows and columns. Press Tab to fill in successive entries.
You can use Grid to preserve or create a matrix structure in evaluations.
Every special character in the Wolfram Language has a full name, such as \[Alpha]. Common characters also have short aliases using the Esc key.
Esc a Esc
Esc b Esc
Esc pi Esc
Esc int Esc
Esc dd Esc
You can enter the character using the full name, \[Alpha]. Once the closing square bracket is typed, the character is substituted for the full name.
Certain special characters are replaced automatically without pressing the Esc key. For example, >= is converted to ≥.