Destructive updating theory

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But we are warned: sea temperatures rising because of climate change rather than El Ninos will not revert to past ‘normal’ temperatures. Marine Protected Areas (MPAs) that are large, old and isolated are recognized to be the ideal solution, but in much of the tropics where humans live in any abundance they are impractical, even impossible: completely restricting fishing is not an option.

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In product development, for example, creative destruction is roughly synonymous with disruptive technology.

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We define a new decidable logic for expressing and checking invariants of programs that manipulate dynamically-allocated objects via pointers and destructive pointer updates.The latter provides a way to naturally specify postconditions that relate the fields on the entry of a procedure to the field on the exit of a procedure.Therefore, it is possible to use the logic to automatically prove partial correctness of programs performing low-level heap mutations.Pointer analysis is a fundamental static program analysis for computing the set of objects that an expression can refer to.Decades of research has gone into developing methods of varying precision and efficiency for pointer analysis for programs that use different language features, but determining precisely how efficient a particular method is has been a challenge in itself.And now, starting before the current El Nino emerged and compounded by the huge, warm ‘Pacific Blob’, we are well into another global bleaching event. Some protective efforts that would reduce other sources of stress on the reefs are possible, for instance reducing both pollution and overfishing, especially of algal grazers. Now they will remain high or higher as the El Nino heat spreads and lingers (dnlr.hawaii.gov) Yet the Great Barrier Reef covers 135,000 square miles and since 1985 half of its coral cover has been lost; little remains of Caribbean coral reefs; the coral reefs around Hawaii and elsewhere in the Pacific have never been under such stress.

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