based on an earlier version of the Wolfram Language.
Developed at Wolfram Research over nearly 20 years, Mathematica has by far the world's most sophisticated and convenient mathematical typesetting technology. Generalizing the concept of a computer language to allow 2D input, Mathematica allows both interactive and programmatic entry of arbitrarily complex typeset expressions, with publication-quality layout continuously maintained in real time.
StandardForm — Mathematica unambiguous format (Ctrl+Shift+N)
TraditionalForm — traditional textbook math notation (Ctrl+Shift+T)
InputForm — linear input form (Ctrl+Shift+I)
Palettes ► Other ► Basic Math Input — bring up a palette of common input notations
Palettes ► Special Characters — access all Mathematica special characters »
(EscpEsc) ▪ (EsciiEsc) ▪ ∞ (EscinfEsc) ▪ (EscintEsc) ▪ (differential d) (EscddEsc) ▪ (EscaEsc) ▪ ...
Text — text within math
HoldForm — display expressions without evaluating them