He was a sixteenth century mathematician, born in Jawor (now in southwestern Poland) who wrote the first book on algebra in the German language. He studied at the University of Vienna. He invented the symbol we now use for square root, and also was the first to define the zero power to equal one.
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Radicals were first used in 1525 in Die Cross. They were first used by Christoff Rudolff, who was a German mathematician.
According to Wikipedia, article on "Square root": "The symbol '√' for the square root was first used in print in 1525 in Christoph Rudolff's Coss, which was also the first to use the then-new signs '+' and '−'."