Download Algebraic Theory of Processes by Matthew Hennessy PDF

By Matthew Hennessy

Algebraic idea of tactics presents the 1st normal and systematic advent to the semantics of concurrent platforms, a comparatively new examine region in machine technology.

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2 resembles the program checkers of Blum and Kannan [33]. It uses interactive proof systems for PSPACE-complete sets [103, 134] to verify a particular instance x of a particular problem in PSPACE Π using an unreliable “interpretation” of Alice’s (the server’s) statements as being about a sequence of other instances of PSPACE-complete problems, which are used to efficiently construct a proof about Π(x). 3. 13, these characterizations show that whenever a problem has a universal protocol, it also has a program checker.

We will note that analogues of this weak verifiability correspond to an agent that may make some errors, and we will see that such agents (that are allowed to fail sometimes) can achieve much harder goals, albeit in a weaker sense. Nevertheless, we also show how verifiable goals can be formulated for a variety of natural goals for communication in Chapter 3, in support of our claim that most natural semantic communication can be modeled as communication in pursuit of verifiable goals. 2) in particular is refined further in Chapter 5, to show that general polynomial-time computation is a verifiable goal for weak (logarithmic space bounded) devices—and so, in a somewhat realistic sense, universal delegation of computation by these weak devices is possible.

95] He never really comes back to explicitly answer this question, but he eventually seems to suggest that what distinguishes a “computer” (or “consciousness”) is the “information bandwidth”—that the predictability he alludes to above is a consequence of it only interacting with its external environment in a limited way. 2, we show that a sufficiently powerful general purpose computer can be recognized without cultural context, since a weak device can “offload” computational work to the more powerful computer without knowledge of the powerful computer’s interface.

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