李白飛Lee, P.H.P.H.Lee2006-07-262018-06-282006-07-262018-06-282004-07-31http://ntur.lib.ntu.edu.tw//handle/246246/20989Let D be a division ring whose group of units satisfies a nontrivial group identity w. Let α be the sum of positive degrees of indeterminates occurring in w. If the center of D contains more than 3α elements, then D is commutative.application/pdf171026 bytesapplication/pdfzh-TW國立臺灣大學數學系暨研究所division ringgroup of unitsgroup identitypolynomial identityreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/20989/1/922115M002017.pdf