Get A Unifying Framework for Structured Analysis and Design PDF

By T. H. Tse

ISBN-10: 0521117879

ISBN-13: 9780521117876

ISBN-10: 0521391962

ISBN-13: 9780521391962

Based methodologies are a favored and strong software in details platforms improvement. many alternative ones exist, every one utilising a few types and so a specification has to be switched over from one shape to a different through the improvement procedure. to unravel this challenge, Dr. Tse proposes a unifying framework at the back of renowned established types. He methods the matter from the viewpoints of algebra and type idea. He not just develops the frameworks but additionally illustrates their sensible and theoretical usefulness. therefore, this e-book will offer perception for software program engineers into how methodologies could be formalized, and may open up a number of purposes and difficulties for theoretical laptop scientists

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Extra info for A Unifying Framework for Structured Analysis and Design Models: An Approach Using Initial Algebra Semantics and Category Theory

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Its value is x, but x is something different from what it was before. In t e r m s of value, rplaca can be described by the equation r p l a ~ a [ x ; ~= ]c ~ n s [ ~ ; c d r [ x ] ] But the effect is quite different: there is no cons involved and a new word is not created. rplacd[x;y] replaces the decrement of x with y. These operators must be used with caution. They can permanently alter existing definitions and other basic memory. They can be used to create circular lists, which can cause infinite printing, and look infinite to functions that search, such a s equal and subst.

Storage for a r r a y s is located in an a r e a of memory called binary program space. V. THE PROGRAM FEATURE The LISP 1 . 5 program feature allows the user to write an Algol-like program containing LISP statements to be executed. An example of the program feature is the function length, which examines a list and decides how many elements there a r e in the top level of the list. The value of length is an integer. Length is a function of one argurnentL. The program uses two program variables -u and y, which can be regarded a s storage locations whose contents a r e to be changed by the program.

Plus[xl;. ;xn] is a function of any number of arguments whose value is the algebraic sum of the arguments. - .. difference[^;^] has for i t s value the algebraic difference of its arguments. minus[x] has for its value -x. times[xl;. ;xn] is a function of any number of arguments, whose value is the product - . (with correct sign) of its arguments. addl[x] has x t l for its value. The value is fixed-point or floating-point, depending on the argument. subl[x] has x-1 for its value. The value is fixed-point or floating-point, depending on the argument.

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A Unifying Framework for Structured Analysis and Design Models: An Approach Using Initial Algebra Semantics and Category Theory by T. H. Tse


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