Z User Workshop, York 1991

Released on by J. E. Nicholls
preview-18

  • Z User Workshop, York 1991 Book Detail

  • Author : J. E. Nicholls
  • Release Date : 2012-12-06
  • Publisher : Springer Science & Business Media
  • Genre : Computers
  • Pages : 404
  • ISBN 13 : 1447132033
  • File Size : 57,57 MB
DOWNLOAD BOOK

Z User Workshop, York 1991 by J. E. Nicholls PDF Summary

Book Description: In ordinary mathematics, an equation can be written down which is syntactically correct, but for which no solution exists. For example, consider the equation x = x + 1 defined over the real numbers; there is no value of x which satisfies it. Similarly it is possible to specify objects using the formal specification language Z [3,4], which can not possibly exist. Such specifications are called inconsistent and can arise in a number of ways. Example 1 The following Z specification of a functionf, from integers to integers "f x : ~ 1 x ~ O· fx = x + 1 (i) "f x : ~ 1 x ~ O· fx = x + 2 (ii) is inconsistent, because axiom (i) gives f 0 = 1, while axiom (ii) gives f 0 = 2. This contradicts the fact that f was declared as a function, that is, f must have a unique result when applied to an argument. Hence no suchfexists. Furthermore, iff 0 = 1 andfO = 2 then 1 = 2 can be deduced! From 1 = 2 anything can be deduced, thus showing the danger of an inconsistent specification. Note that all examples and proofs start with the word Example or Proof and end with the symbol.1.

Disclaimer: www.yourbookbest.com does not own Z User Workshop, York 1991 books pdf, neither created or scanned. We just provide the link that is already available on the internet, public domain and in Google Drive. If any way it violates the law or has any issues, then kindly mail us via contact us page to request the removal of the link.

Z User Workshop, York 1991

Z User Workshop, York 1991

File Size : 37,37 MB
Total View : 6515 Views
DOWNLOAD

In ordinary mathematics, an equation can be written down which is syntactically correct, but for which no solution exists. For example, consider the equation x

Z User Workshop, London 1992

Z User Workshop, London 1992

File Size : 46,46 MB
Total View : 1952 Views
DOWNLOAD

The Z notation has been developed at the Programming Research Group at the Oxford University Computing Laboratory and elsewhere for over a decade. It is now use

Z User Workshop, Cambridge 1994

Z User Workshop, Cambridge 1994

File Size : 42,42 MB
Total View : 5321 Views
DOWNLOAD

This volume contains papers from the Eighth Z User Meeting, to be held at the University of Cambridge from 29 - 30 June 1994. The papers cover a wide range of i