# Polynomial time approximation schemes for some dense instances of NP-hard optimization problems

Invited Talk

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## Abstract

We overview recent results on the existence of polynomial time approximation schemes for some dense instances of NP-hard optimization problems. We indicate further some inherent limits for existence of such schemes for some other dense instances of the optimization problems.

## Keywords

STEINER Tree Vertex Cover STEINER Tree Problem Polynomzal Tzme Approxzmatzon Scheme Dense Graph
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