meaning of power cycle

1. power cycle Or "cycle power", "cycle" To turn a machines power off and on, with the intention of clearing some kind of hung or gronked state. Synonym 120 reset; see also Big Red Switch. Compare Vulcan nerve pinch, bounce and boot, and see the AI Koan about Tom Knight and the novice. [Jargon File] powerdomain The powerdomain of a domain D is a domain containing some of the subsets of D. Due to the asymmetry condition in the definition of a partial order and therefore of a domain the powerdomain cannot contain all the subsets of D. This is because there may be different sets X and Y such that X <= Y and Y <= X which, by the asymmetry condition would have to be considered equal. There are at least three possible orderings of the subsets of a powerdomain: Egli-Milner: X <= Y iff for all x in X, exists y in Y: x <= y and for all y in Y, exists x in X: x <= y "The other domain always contains a related element". Hoare or Partial Correctness or Safety: X <= Y iff for all x in X, exists y in Y: x <= y "The bigger domain always contains a bigger element". Smyth or Total Correctness or Liveness: X <= Y iff for all y in Y, exists x in X: x <= y "The smaller domain always contains a smaller element". If a powerdomain represents the result of an abstract interpretation in which a bigger value is a safe approximation to a smaller value then the Hoare powerdomain is appropriate because the safe approximation Y to the powerdomain X contains a safe approximation to each point in X. "<=" is written in LaTeX as sqsubseteq.


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