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Sep 18, 2014 at 22:11 comment added Ilya Bogdanov @Alvin: What I am almost sure about is it was not Krein, otherwise I would remember it. Alex: I think the only interesting part is that trick attributed surely not to myself, so it would be better to perform some search...
Sep 18, 2014 at 21:29 comment added AatG Great! I like the Caratheodory trick. I asked this question to understand two different models for polynomial interpolation in machine learning. I'm writing a paper that I plan to submit to a conference, so space is tight, but I would love to include this argument with attribution to you as its source if possible. Do I have your permission to do so?
Sep 18, 2014 at 21:03 vote accept AatG
Sep 18, 2014 at 12:59 comment added Alvin "Someone else" is most likely Krein
Sep 18, 2014 at 8:44 history answered Ilya Bogdanov CC BY-SA 3.0