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Reference.org
Contour set
open-in-new
<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, contour sets <a href="/facts/Generalization/v0b1pwUx">generalize</a> and <a href="/facts/Formal_system/KaeDAjK7">formalize</a> the everyday notions of </p> <ul><li>everything superior to something</li> <li>everything superior or equivalent to something</li> <li>everything inferior to something</li> <li>everything inferior or equivalent to something.</li></ul>