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Qu'est-ce (qui) est symbolic algebra - définition
![A Texas Instruments [[TI-Nspire]] calculator that contains a computer algebra system](https://commons.wikimedia.org/wiki/Special:FilePath/Computer algebra system.jpg?width=200 "A Texas Instruments [[TI-Nspire]] calculator that contains a computer algebra system")
Wikipédia
A computer algebra system (CAS) or symbolic algebra system (SAS) is any mathematical software with the ability to manipulate mathematical expressions in a way similar to the traditional manual computations of mathematicians and scientists. The development of the computer algebra systems in the second half of the 20th century is part of the discipline of "computer algebra" or "symbolic computation", which has spurred work in algorithms over mathematical objects such as polynomials.
Computer algebra systems may be divided into two classes: specialized and general-purpose. The specialized ones are devoted to a specific part of mathematics, such as number theory, group theory, or teaching of elementary mathematics.
General-purpose computer algebra systems aim to be useful to a user working in any scientific field that requires manipulation of mathematical expressions. To be useful, a general-purpose computer algebra system must include various features such as:
- a user interface allowing a user to enter and display mathematical formulas, typically from a keyboard, menu selections, mouse or stylus.
- a programming language and an interpreter (the result of a computation commonly has an unpredictable form and an unpredictable size; therefore user intervention is frequently needed),
- a simplifier, which is a rewrite system for simplifying mathematics formulas,
- a memory manager, including a garbage collector, needed by the huge size of the intermediate data, which may appear during a computation,
- an arbitrary-precision arithmetic, needed by the huge size of the integers that may occur,
- a large library of mathematical algorithms and special functions.
The library must not only provide for the needs of the users, but also the needs of the simplifier. For example, the computation of polynomial greatest common divisors is systematically used for the simplification of expressions involving fractions.
This large amount of required computer capabilities explains the small number of general-purpose computer algebra systems. Significant systems include Axiom, Maxima, Magma, Maple, Mathematica, and SageMath.
