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Michael Trick
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Michael Trick commented on a post on Blogger.
Roy's strategy (as given) is not quite tit-for-tat.  Tit-for-tat would include a promise to start cooperating again after defecting if opponent cooperated.  http://www.iterated-prisoners-dilemma.net/prisoners-dilemma-strategies.shtml calls Roy's strategy "grudger".  Though we can't see what they really intended given the outcome.

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Michael Trick commented on a post on Blogger.
Any 2-3PM or do you have a particular time zone in mind?  UK I would guess?

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Nope: not >=.  How about x_j + 1 on the LHS?  With >=.  Or maybe I should just work it out before posting.

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Are these constraints (in the x variables) what you wanted?  Take K=3 and let x_1, x_2, x_3 = 1 and the rest zero.  You have a constraint 2x_3 <= x_2+x_4 which doesn't quite work.  Maybe >= ?

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A new post on creating optimal ecological structures. I was thinking of exploring the robustness of optimal designs, but the panda story overwhelmed me.

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International Transactions in Operational Research is now an ISI journal

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New post on my blog includes discussion on how I don't understand google+
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