By Ralph-Johan Back

Much present examine in laptop technological know-how is anxious with questions: is a software right? and the way will we enhance an accurate software retaining correctness? This latter query is called the refinement of courses and the aim of this e-book is to think about those questions in a proper surroundings. in reality, correctness seems to be a distinct case of refinement and so the point of interest is on refinement. even though an inexpensive heritage wisdom is thought from arithmetic and CS, the booklet is a self-contained advent appropriate for graduate scholars and researchers coming to this topic for the 1st time. there are various workouts supplied of various levels of challenge.

**Read or Download Refinement Calculus: A Systematic Introduction PDF**

**Best microprocessors & system design books**

Booklet by means of Gerard Hartnett, Peter Barry

**FM8501: A Verified Microprocessor**

The FM 8501 microprocessor used to be invented as a commonplace microprocessor slightly just like a PDP-11. The significant concept of the FM 8501 attempt used to be to work out if it used to be attainable to precise the user-level specification and the layout implementation utilizing a proper good judgment, the Boyer-Moore common sense; this technique approved an entire automatically checked facts that the FM 8501 implementation absolutely applied its specification.

**Code Optimization Techniques for Embedded Processors: Methods, Algorithms, and Tools**

The construction blocks of brand new and destiny embedded structures are complicated highbrow estate elements, or cores, lots of that are programmable processors. generally, those embedded processors generally were professional grammed in meeting languages as a result of potency purposes. this means time eating programming, large debugging, and coffee code portability.

**Worst-Case Execution Time Aware Compilation Techniques for Real-Time Systems**

For real-time structures, the worst-case execution time (WCET) is the most important goal to be thought of. ordinarily, code for real-time structures is generated with out taking this target under consideration and the WCET is computed simply after code new release. Worst-Case Execution Time conscious Compilation strategies for Real-Time platforms offers the 1st finished process integrating WCET issues into the code new release technique.

- Embedded Systems: Real-Time Interfacing to ARM Cortex-M Microcontrollers
- Digital Signal Processing in VLSI
- PIC32 Microcontrollers and the Digilent Chipkit: Introductory to Advanced Projects
- Cloud Connectivity and Embedded Sensory Systems
- Advanced Model-Based Engineering of Embedded Systems: Extensions of the SPES 2020 Methodology

**Extra resources for Refinement Calculus: A Systematic Introduction**

**Sample text**

It is easy to see that A U --, A = D and A n --, A = 0, so the requirements on the complement are met. The natural numbers do not form a Boolean lattice. Even if we add the limit ordinal w to Nat, so that we get a complete distributive lattice, we still do not have a Boolean lattice. Atomic Lattices Let A be a lattice with a least element. 1 v b=a. Thus, an atom is an element that is one step above the bottom element in a Hasse diagram. A lattice A is said to be atomic if for each element x in A, we have that x = u{a E A I a is an atom /\ a I;; x} .

D gm :: Sm fi = {gd; S\ u ... U {gm}; Sm This statement will again cause a breach of the contract if none of the assertions holds in the state. If at least one of the assertions holds, then our agent gets to choose the alternative to continue with. This construct can be interpreted as a context-sensitive menu choice: the alternatives from which our agent chooses are items on a menu, and the assertions determine which of these items are enabled in a particular state. Recursive Contracts We can make the language of contracts even more interesting from a programming point of view by permitting recursive statements of contracts.

We construct the program and its specification hand in hand, making the program and its specification more precise as part of the program construction process. A variant of explorative programming arises when the postcondition q is given, and the task is to find an interesting statement S and a precondition p such that p ft S ~ q holds. This leads to a form of backward program derivation, where we try to derive from the postcondition a program that will achieve this postcondition. Another variant is that the precondition p is given, and we try to derive an interesting statement S and a postcondition q such that p ft S ~ q holds.