I'm confused how the paper's result (which you have posted) solves this question. I didn't read the paper, but the abstract only gave a looser bound that the sum of the first two eigenvalues is <= 2/sqrt(3) * n (and not just n).
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CSI of Charles University
Is this really solved?
I'm confused how the paper's result (which you have posted) solves this question. I didn't read the paper, but the abstract only gave a looser bound that the sum of the first two eigenvalues is <= 2/sqrt(3) * n (and not just n).