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=== Data representation ===
As [[numerical software]] is highly efficient for approximate [[numerical computation]], it is common, in computer algebra, to emphasize ''exact'' computation with exactly represented data. Such an exact representation implies that, even when the size of the output is small, the intermediate data generated during a computation may grow in an unpredictable way. This behavior is called ''expression swell''<ref>{{Cite web |title=Lecture 12: Rational Functions and Conversions — Introduction to Symbolic Computation 1.7.6 documentation |url=https://homepages.math.uic.edu/~jan/mcs320/mcs320notes/lec12.html |access-date=2024-03-31 |website=homepages.math.uic.edu}}</ref>. To obviate this problem, various methods are used in the representation of the data, as well as in the algorithms that manipulate them.<ref>{{Cite journal |last=Neut |first=Sylvain |last2=Petitot |first2=Michel |last3=Dridi |first3=Raouf |date=2009-03-01 |title=Élie Cartan’s geometrical vision or how to avoid expression swell |url=https://www.sciencedirect.com/science/article/pii/S0747717108001132 |journal=Journal of Symbolic Computation |series=Polynomial System Solving in honor of Daniel Lazard |volume=44 |issue=3 |pages=261–270 |doi=10.1016/j.jsc.2007.04.006 |issn=0747-7171}}</ref>
==== Numbers ====
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