Mathematica is a computer algebra system produced by Wolfram Research. The first publically available version, 1.0, came out in 1988, the most recent, 5.2, in 2005. Although primarily intended for algebraic and arithmetic computations, Mathematica is also capable of text manipulation and graphics.
The standard installation provides a kernel that does the work of performing the computations requested by the user and a frontend that displays the input and output; the two communicate using "MathLink." Wolfram provides an API for using a different kernel or frontend.
The standard frontend can execute commands whether they are written as they would in a programming language (e.g., “Sqrt[Pi^e] ”) or typeset using the palettes (e.g., “
”).
Error messages are usually given in blue text but do not require clearance by a special key (as they would in a standalone calculator). Division by zero gives the error message “Power::infy: Infinite expression
encountered” and the result “ComplexInfinity”. gives the error message “Power::indet::Indeterminate expression encountered” and the result “Indeterminate”. In some contexts Mathematica will attempt to guess what kind of result the user wants for these infinite or indeterminate expressions, such as when taking certain limits.
Unix and Linux installations include a commandline frontend that can only accept commands in the former)
Like Maple, Mathematica has its own field in the OnLine Encyclopedia of Integer Sequences.
Official website
 1
 S. Wolfram The Mathematica Book, 4th Ed. Cambridge: Cambridge University Press (1999): 3.1.8
