60-256 System Programming: Introduction to Unix Content COMP 2560 System Programming: Introduction to Unix Courtesy of Dr. B. Boufama Modified by Dan Wu School of Computer Science University of Windsor Instructor: Dr. Dan Wu 1 Copyright @ 2019, 2020, 2021 all rights reserved Content Content 1 Introduction 2 A tour of Unix 3 Summary 2 […]
University of Sussex 4 May 2018 Feedback Limits of Computation Test – Dr Bernhard Reus →a→→→→→→→→→ → → CandidateNo. • Please answer ALL questions by writing on THIS SHEET. You are not allowed to use any other documents or devices. • Please write your candidate number in the box above. • Questions are equally weighted
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Limits of Computation 3 – The WHILE-language Bernhard Reus 1 Last time • we discussed what problems are • discussed that our first objective is to show that at least one of those problems cannot be “computed” • defined what computable means in terms of “effective procedures” • but did not commit to any specific
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University of Sussex Spring 2021 Informatics Limits of Computation Exercises 6 Specialisers, Self-referencing Programs & Time Measure (Lectures 10–12) 1. Assume you need a program with just one argument that com- putes “+3”, i.e. adds 3 to the given input number (in unary rep- resentation). How do you create and call this program without writing
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Limits of Computation 11 – Church-Turing Thesis Bernhard Reus 1 The story so far • • We have found problems that cannot be solved by a WHILE program (Halting, Busy- Beaver, Tiling, Ambiguity of CFGs, etc). But this does not mean yet they could not be solved by a different machine model (different definition of
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Limits of Computation 20/21 Part III Computability (Some notes on Lectures 9–11) Bernhard Reus February 20, 2021 9 More undecidable problems Next we consider more undecidable problems. There are quite a number of undecidable problems, infinitely many, and they appear (in disguises) more often that you might think. But before we do that, let us
University of Sussex Informatics Spring 2021 Limits of Computation Feedback Exercises 3 Programs-As-Data, Self-Interpreter, and hwhile (covers Lectures 3–6) Dr Bernhard Reus 1. Consider the programs p1 in Figure 1 and add in Figure 2. p1 read L { R := 0; X := hd L; Y := hd tl L; while X { R
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Limits of Computation 18 – The One Million Dollar Question Bernhard Reus 1 A Complexity Class for Problems from Last Time • last time we have seen many problems which have not been shown (yet) to be in P but … • … we can show that their solutions can be checked in polynomial time
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University of Sussex Spring 2021 Informatics Limits of Computation Feedback for Exercises 6 Dr Bernhard Reus Specialisers, Self-referencing Programs & Time Measure (Lectures 10–12) 1. Assume you need a program with just one argument that com- putes “+3”, i.e. adds 3 to the given input number (in unary representation). How do you create and call
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Limits of Computation 2020/21 Part IV Complexity: Time Measure and Classes (Some notes on Lectures 12–15) Bernhard Reus March 8, 2021 In this part of the course we focus on complexity results. We thus ask the question “is it feasible to compute …?” rather than “is is computable?” Therefore we focus on decidable problems and
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