## Verified functional programming in Agda [electronic resources] / Aaron Stump ; editor in chief, M. Tamer Ozsu.

Material type: TextSeries: ACM books ; #9Publication details: [San Rafael] : ACM Books, 2016Description: 1 online resources (xxiv, 283 pages) : illustrations (black and white) ; 25 cmISBN: 9781970001266 (ePub); 9781970001259 (pdf)Subject(s): Functional programming (Computer science) | Functional programming languages | Agda (Computer program language) | Type theoryDDC classification: 005.114 LOC classification: QA76.62 | .S78 2016ebOnline resources: Available in ACM Digital Library. Requires Log In to view full text.Item type | Current library | Collection | Call number | Copy number | Status | Date due | Barcode |
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General Circulation | APU Library Online Database | E-Book | QA76.62 .S78 2016eb (Browse shelf (Opens below)) | 1 | Available |

"[ISSN] 2374-6777 electronic."--Title page verso.

Co-published by Morgan & Claypool Publishers.

Formerly CIP. Uk

Includes bibliographical references and index.

1. Functional programming with the Booleans -- 1.1 Declaring the datatype of Booleans -- 1.2 First steps interacting with Agda -- 1.3 Syntax declarations -- 1.4 Defining Boolean operations by pattern matching: negation -- 1.5 Defining Boolean operations by pattern matching: and, or -- 1.6 The if-then-else operation -- 1.7 Conclusion -- Exercises --

9. Reasoning about termination -- 9.1 Termination proofs -- 9.2 Operational semantics for SK combinators -- 9.3 Conclusion -- Exercises --

3. Natural numbers -- 3.1 Peano natural numbers -- 3.2 Addition -- 3.3 Multiplication -- 3.4 Arithmetic comparison -- 3.5 Even/odd and mutually recursive definitions -- 3.6 Conclusion -- Exercises --

5. Internal verification -- 5.1 Vectors -- 5.2 Binary search trees -- 5.3 Sigma types -- 5.4 Braun trees -- 5.5 Discussion: internal vs. external verification -- 5.6 Conclusion -- Exercises --

7. Generating Agda parsers with gratr -- 7.1 A primer on grammars -- 7.2 Generating parsers with gratr -- 7.3 Conclusion -- Exercises --

4. Lists -- 4.1 The list datatype and type parameters -- 4.2 Basic operations on lists -- 4.3 Reasoning about list operations -- 4.4 Conclusion -- Exercises --

2. Introduction to constructive proof -- 2.1 A first theorem about the Booleans -- 2.2 Universal theorems -- 2.3 Another example, and more on implicit arguments -- 2.4 Theorems with hypotheses -- 2.5 Going deeper: Curry-Howard and constructivity -- 2.6 Further examples -- 2.7 Conclusion -- Exercises --

8. A case study: Huffman encoding and decoding -- 8.1 The files -- 8.2 The input formats -- 8.3 Encoding textual input -- 8.4 Decoding encoded text -- 8.5 Conclusion -- Exercises --

6. Type-level computation -- 6.1 Integers -- 6.2 Formatted printing -- 6.3 Proof by reflection -- 6.4 Conclusion -- Exercises --

Appendix A. Quick guide to symbols -- Appendix B. Commonly used Emacs control commands -- Appendix C. Some extra Emacs definitions -- References -- Index -- Author's biography.

10. Intuitionistic logic and Kripke semantics -- 10.1 Positive propositional intuitionistic logic (PPIL) -- 10.2 Kripke structures -- 10.3 Kripke semantics for PPIL -- 10.4 Soundness of PPIL -- 10.5 Completeness -- 10.6 Conclusion -- Exercises --

Agda is an advanced programming language based on Type Theory. Agda's type system is expressive enough to support full functional verification of programs, in two styles. In external verification, we write pure functional programs and then write proofs of properties about them. The proofs are separate external artifacts, typically using structural induction. In internal verification, we specify properties of programs through rich types for the programs themselves. This often necessitates including proofs inside code, to show the type checker that the specified properties hold. The power to prove properties of programs in these two styles is a profound addition to the practice of programming, giving programmers the power to guarantee the absence of bugs, and thus improve the quality of software more than previously possible. The book begins with an introduction to functional programming through familiar examples like booleans, natural numbers, and lists, and techniques for external verification. Internal verification is considered through the examples of vectors, binary search trees, and Braun trees. More advanced material on type-level computation, explicit reasoning about termination, and normalization by evaluation is also included. The book also includes a medium-sized case study on Huffman encoding and decoding.

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