| 書目名稱 | Z User Workshop, York 1991 | | 副標(biāo)題 | Proceedings of the S | | 編輯 | J. E. Nicholls | | 視頻video | http://file.papertrans.cn/1061/1060385/1060385.mp4 | | 叢書名稱 | Workshops in Computing | | 圖書封面 |  | | 描述 | 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. | | 出版日期 | Conference proceedings 1992 | | 關(guān)鍵詞 | calculus; database; formal method; formal methods; high-integrity software; logic; programming; structured | | 版次 | 1 | | doi | https://doi.org/10.1007/978-1-4471-3203-5 | | isbn_softcover | 978-3-540-19780-5 | | isbn_ebook | 978-1-4471-3203-5Series ISSN 1431-1682 | | issn_series | 1431-1682 | | copyright | British Computer Society 1992 |
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書目名稱Z User Workshop, York 1991影響因子(影響力)
書目名稱Z User Workshop, York 1991影響因子(影響力)學(xué)科排名
書目名稱Z User Workshop, York 1991網(wǎng)絡(luò)公開度
書目名稱Z User Workshop, York 1991網(wǎng)絡(luò)公開度學(xué)科排名
書目名稱Z User Workshop, York 1991被引頻次
書目名稱Z User Workshop, York 1991被引頻次學(xué)科排名
書目名稱Z User Workshop, York 1991年度引用
書目名稱Z User Workshop, York 1991年度引用學(xué)科排名
書目名稱Z User Workshop, York 1991讀者反饋
書目名稱Z User Workshop, York 1991讀者反饋學(xué)科排名
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