Constraint satisfaction problem

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What Wikipedia says

Constraint satisfaction problems (CSPs) are mathematical questions defined as a set of objects whose state must satisfy a number of constraints or limitations. CSPs represent the entities in a problem as a homogeneous collection of finite constraints over variables, which is solved by constraint satisfaction methods.

Excerpt from the Wikipedia article “Constraint satisfaction problem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Tim Stellmach, Public domain, via Wikimedia Commons.