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surd

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.02 sec.
surd
Maths an expression containing one or more irrational roots of numbers, such as 2&#221A3 + 3&#221A2 + 6

surd [sərd]
(mathematics)
A sum of one or more roots of rational numbers, some or all of which are themselves irrational numbers.


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But perhaps the thing to do instead is to take a trip to the Spiral Jetty, if only because, as Smithson dreamed it, "in the Spiral Jetty the surd takes over and leads one into a world that cannot be expressed by number or rationality.
Filling the institutional exhibition space, wall to wall, floor to ceiling, Darboven's surd sampling of a century seems devised to escape the viewer's visual reach.
 
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