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A non-negativity constraint may be applied very simply to a parameter whose value is to be determined by means of a change of variable. For example, constraining the value of x to be positive may be achieved by determining the value of a parameter p which is numerically equal to x<sup>2</sup>. See, for example, Non-linear Optimization Techniques, by M.J. Box, D.Davies and W.H.Swan, published by Oliver & Boyd, Edinburgh, 1969, Chapter 5 "Constrained Optimization" for more examples. This is very useful when the parameter concerned is the value of a physical object which, by its nature, must be a positive number. [[User:Petergans|Petergans]] ([[User talk:Petergans|talk]]) 13:58, 25 January 2019 (UTC)
== Should this article include a list of constraint programming languages? ==
This article used to include a list of constraint programming languages (such as [[AIMMS]] and [[Constraint Handling Rules]]), but this list was deleted in [https://en.wikipedia.org/w/index.php?title=Constraint_programming&diff=944545642&oldid=937685444 this revision] by {{u|MrOllie}}.
Should a list of constraint languages be included in this article, or should it be included in another article (such as the main [[list of programming languages by type]])? [[User:Jarble|Jarble]] ([[User talk:Jarble|talk]]) 14:21, 27 September 2021 (UTC)
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