The sum of squared logarithms inequality in arbitrary dimensions

@article{Borisov2015TheSO,
  title={The sum of squared logarithms inequality in arbitrary dimensions},
  author={Lev Borisov and Patrizio Neff and Suvrit Sra and Christian Thiel},
  journal={PAMM},
  year={2015},
  volume={16}
}
We prove the sum of squared logarithms inequality (SSLI) which states that for nonnegative vectors x, y ∈ ℝn whose elementary symmetric polynomials satisfy ek(x) ≤ ek(y) (for 1 ≤ k < n) and en(x) = en(y) , the inequality ∑i(log xi)2 ≤ ∑i(log yi)2 holds. Our proof of this inequality follows by a suitable extension to the complex plane. In particular, we show that the function f : M ⊆ ℂn → ℝ with f(z) = ∑i(log zi)2 has nonnegative partial derivatives with respect to the elementary symmetric… 
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17 Citations

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