A tracial Nullstellensatz
classification
🧮 math.RA
math.FA
keywords
freenullstellensatzpolynomialstracialcombinationcommutatorseitherevaluated
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The main result of this note is a tracial Nullstellensatz for free noncommutative polynomials evaluated at tuples of matrices of all sizes: Suppose f_1,...,f_r,f are free polynomials, and tr(f) vanishes whenever all tr(f_j) vanish. Then either 1 or f is a linear combination of the f_j modulo sums of commutators.
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