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  • $\begingroup$ Many thanks for your answer. For the question about the validation of the theorem: Is there not somehow an $\inf$ over $\alpha$ missing? $\endgroup$ Commented Oct 25, 2015 at 16:06
  • $\begingroup$ @user8: I added a paragraph at the end of my answer, you see the point with the infimum now? $\endgroup$ Commented Oct 26, 2015 at 16:22