Abstract
An elementary proof is given, to show that the quartic form X-1(4) + X-2(4) + X-3(4) + X-4(4) cannot be written as a sum of three squares of real quadratic forms. (C) 2004 Elsevier B.V. All rights reserved.
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An elementary proof that the length of X14+X24+X34+X44 is 4
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