Earliest Uses Of Symbols Of Operation And Grouping 2, page 78). The radical symbol first appeared in 1525 in Die Coss by ChristoffRudolff (14991545). He used (without the vinculum) for square roots. http://www.veling.nl/anne/templars/operation.html
Extractions: Earliest Uses of Symbols of Operation and Grouping Last revision: Aug. 15, 1997 ADDITION AND SUBTRACTION SYMBOLS Plus (+) and minus (-). The plus symbol as an abbreviation for the Latin et (and), though appearing with the downward stroke not quite vertical, was found in a manuscript dated 1417 (Cajori). The + and - symbols first appeared in print in Mercantile Arithmetic or Behende und hubsche Rechenung auff allen Kauffmanschafft , by Johannes Widmann (born c. 1460), published in Leipzig in 1489. However, they referred not to addition or subtraction or to positive or negative numbers, but to surpluses and deficits in business problems (Cajori vol. 1, page 128). Cajori says, "There is clear evidence that, as a lecturer at the University of Leipzig, Widmann had studied manuscripts in the Dresden library in which + and - signify operations, some of these having been written as early as 1486." Johnson (page 144) says a series of notes from 1481, annotated by Widmann, contain the + and - symbols, and he asks whether Widman could have copied these symbols from some unknown professor at the University of Leipzig. Johnson also says that a student's notes from one of Widmann's 1486 lectures show the + and - signs.
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