For a rational matrix function Φ with poles outside the unit circle, we estimate the degree of the unique superoptimal approximation 𝒜Φ by matrix functions analytic in the unit disk. We obtain sharp ...
We give examples of non-isotrivial K3 surfaces over complex function fields with Zariskidense rational points and Néron-Severi rank one. One of the largest publishers in the United States, the Johns ...
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