Classification of All Noncommutative Polynomials Whose Hessian Has Negative Signature One and a Noncommutative Second Fundamental Form
نویسندگان
چکیده
Every symmetric polynomial p = p(x) = p(x1, . . . , xg) (with real coefficients) in g noncommuting variables x1, . . . , xg can be written as a sum and difference of squares of noncommutative polynomials:
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