This material is based upon work supported by the
National Science Foundation
under Grant No. DUE-0336493


STEP- Science, Technology, Engineering, and Mathematics Talent Expansion Program
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The symbol √ first appeared in print around 1525. In Latin, "radix" means root, and it was contracted to a small "r." The present symbol may have evolved from the manuscript form of that small "r." 
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National Science Foundation.