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20112026
most citedOn the integral Hodge conjecture for real varieties, I

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math.AG2017★ 10 cited

Sums of three squares and Noether-Lefschetz loci

Olivier Benoist

We show that the set of real polynomials in two variables that are sums of three squares of rational functions is dense in the set of those that are positive semidefinite. We also…