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268 Process Part of POOSL where PS is a typical element of the set ParStat of parameterised data statements. PS :: E ¡ ¡ ¡ x : PE u : PE PS1;PS2 if PE then PS1 else PS2 fi ¡ do PE then PS od ¡ ¥ L Chan denotes a collection of channels and f is a so-called channel renaming function. The collection of all channel renaming functions is denoted ChanRen and ranges over ¥¡ ¡ ¡ f . ChanRen Chan £ Chan The first two parameterised behaviour specifications C p (PE1 ¥¡ ¡ ¡ ¥ PEr) and C c (PE1 , ¡ ¡ , PEr) denote a single (parameterised) instance of some process class C p y1 ¥¡ ¡ ¡ ¥ yr and some cluster class C c P1 ¥¡ ¡ ¡ ¥ Pr respectively. The next kind of specifications BSpec p 1 fications BSpec p 1 and BSpec p BSpecp2 expresses the parallel composition of speci- ¢ 2. Assume, for example, that the class definition of a class, say Cc ¥ P2 P1 , contains behaviour specification C p 1 (P1) C ¢ p 2 (P2). This specification expresses the behaviour of two (parameterised) instances, one of some process class C p y1 1 and the other of some process class Cp , which execute in parallel and which (perhaps) y2 communicate through their common channels. The channel set of class Cc ¥ P2 P1 is the union of the channel sets of classes Cp and C y1 p . An instance of class C y2 c ¥ P2 P1 can send and receive any message which can be sent and received by instances of either C p y1 1 or C p y2 2 . The parallel composition combinator is comparable with the composition combinator of CCS. The fourth kind of behaviour specification is called channel hiding. A channel hiding BSpecp L expresses a specification BSpecp from which the channels in L are made unobservable. This means that other (external) instances cannot communicate through channels in L with instances contained in specification BSpecp . Assume, for example, that the method definition of a class Cc ¥ P2 P1 contains a behaviour specification (C p ¢ 1(P1) C p 2(P2)) £ . This means that, even though classes C ch¦ p y1 1 and C p y2 2 may contain channel ch, class Cc ¥ P2 P1 may not. Channel ch may only be used for the communication between (parameterised) instances C p 1 (P1) and C p 2 (P2). The channel hiding constructor is similar to the restriction combinator of CCS. The last sort of specification expresses a channel renaming. The channel renaming BSpec p § f denotes a specification BSpec p from which the channels are renamed as dictated by f . We shall often write ch¡1 © ch1 ¥¡ ¡ ¡ ¥ ch¡n © chn for the renaming function f for which f (chi) ch¡i for i 1¥¡ ¡ ¡ ¥ n and f (ch) ch otherwise. Channel renaming can be very useful if several instances of the same class are used within different environments and have to communicate through different channels.
9.4 Context Conditions 269 We are now ready to define what we consider to be a specification of a system. A system specification consists of four parts. The first part is a behaviour specification BSpec which expresses how the actual system is composed from instances of classes defined in Sys p . A behaviour specification is a parameterised behaviour specification which contains no expression parameters. We will let BSpecifications denote the set of all behaviour specifications, and we let it range over BSpec¥¡ ¡ ¡ BSpec :: C p (E1 ¥¡ ¡ ¡ ¥ Er) ¡ C c (E1 ¥¡ ¡ ¡ ¥ Er) ¡ ¢ ¡ BSpec1 BSpec2 BSpec L BSpec§ f ¡ Cp ¥¡ ¡ ¡ ¥ (E1 Er) and Cc ¥¡ ¡ ¡ ¥ (E1 Er) denote an instance of some process class Cp ¡ ¡ ¥ yr re- y1¥¡ spectively of some cluster class Cc ¥¡ ¡ ¡ ¥ Pr P1 , initialised to expressions ¥¡ ¡ ¡ ¥ E1 Er. These expressions are called initialisation expressions, since they initialise the instance. Upon initialisation of instance Cp ¥¡ ¡ ¡ ¥ (E1 Er), expressions ¥¡ ¡ ¡ ¥ E1 Er are evaluated from left to right and the results are bound to the corresponding instance y1¥¡ ¡ ¡ ¥ variables yr. All other instance variables are initialised to nil. Then the initial method is called. Upon initialisation of the instance of cluster class Cc ¥¡ ¡ ¡ ¥ Pr P1 , expression parameters ¥¡ ¡ ¡ ¥ P1 Pr are syntactically substituted by ¥¡ ¡ ¡ ¥ E1 Er. Then all constituents of the behaviour specification are initialised. The second part of a system specification is an empty list. The meaning of this part will become clear in Subsection 9.5.2. The third part is a system Sys p which contains the set of all process classes and cluster classes, and the last part is a system Sys of non-primitive classes of data objects. Formally, we define the set of all system specifications SSpecifications, with typical elements SSpec¥¡ ¡ ¡ , as SSpec :: BSpec¥ ¥ Sys p ¥ Sys 2 9.4 Context Conditions In this section we will describe the context conditions that have to be satisfied by specification ¥ Sys BSpec¥ p Sys to be valid. The set of conditions is partitioned into the ¥ following three groups: Conditions concerning Sys (1’) All context conditions defined in Section 8.4 have to be satisfied. Conditions concerning Sys p 2 In practice we often omit the empty list and write BSpec Sys p Sys in stead of BSpec Sys p Sys .
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Specification of Reactive Hardware/
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to Leny, Inge and our parents
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Contents Acknowledgements v 1 Intro
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CONTENTS ix 4.6.5 Aggregate Semanti
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CONTENTS xi 6 Modelling of Concurre
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CONTENTS xiii 6.6.7.2 System Specif
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CONTENTS xv 11.4.2.3 Requirements C
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List of Figures 1.1 Chapter Overvie
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LIST OF FIGURES xix 6.16 Strongly D
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Chapter 1 Introduction 1.1 Objectiv
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1.1 Objectives 3 understood and sti
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1.1 Objectives 5 Informal and Forma
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1.2 Thesis Organisation 7 Chapter 1
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1.2 Thesis Organisation 9 Recommend
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Chapter 2 On Specification of React
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2.3 Specifications, Models and View
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2.4 Specification Languages, Formal
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2.4 Specification Languages, Formal
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2.5 Modelling Concepts 23 entirety.
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2.5 Modelling Concepts 25 Tradition
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2.6 Activity Frameworks for Specifi
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2.6 Activity Frameworks for Specifi
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2.7 Summary 31 offer many guideline
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Chapter 3 Concepts for Analysis, Sp
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3.3 Concepts 35 3. creation of a sy
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3.5 Combining Compatible Concepts 3
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3.6 Practical Use of Concepts 39 3.
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3.6 Practical Use of Concepts 41 Th
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3.6 Practical Use of Concepts 43 ac
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3.6 Practical Use of Concepts 45 ac
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3.6 Practical Use of Concepts 47 wa
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3.6 Practical Use of Concepts 49 Ge
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3.6 Practical Use of Concepts 51 Re
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3.7 Summary and Concluding Remarks
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Chapter 4 Abstraction of a Problem
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4.1 Introduction 57 earlier phase t
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4.2 Objects 59 An object can mean t
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4.2 Objects 61 wonder what other ob
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4.3 Classes 63 A message interface
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4.3 Classes 65 Class B Attributes M
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4.4 Data Objects and Process Object
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4.5 Clusters 79 flows. Clusters ena
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4.6 Aggregates 81 Therefore a compl
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4.6 Aggregates 83 4.6.4 Clustered A
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4.6 Aggregates 85 An old philosophi
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4.7 Identity and Object Identifiers
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4.8 Properties of Composites 89 for
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4.8 Properties of Composites 91 com
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4.8 Properties of Composites 93 Whe
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4.8 Properties of Composites 95 In
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4.9 Channel Hiding 97 Servant A Sup
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4.11 Composites and Hierarchies 99
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4.12 Object Variety 101 Part class
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4.13 Object Class Models 103 Anothe
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4.13 Object Class Models 105 of obj
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4.14 Attributes and Variables 107 c
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4.14 Attributes and Variables 109 4
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4.15 Operations, Services, Methods
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4.15 Operations, Services, Methods
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4.17 Summary 115 Accidental Propert
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Chapter 5 Concepts for the Integrat
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5.2 Architecture 119 Requirements D
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5.3 Design Philosophy 121 this. The
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5.4 Essential Model and Extended Mo
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5.4 Essential Model and Extended Mo
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5.6 Architecture and Implementation
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5.7 Views 129 Management £ £ £ P
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5.7 Views 131 Behaviour Behaviour U
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5.8 Boundaries 133 5.8 Boundaries 5
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5.8 Boundaries 135 x x Object A y z
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5.8 Boundaries 137 x w w x Object A
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5.8 Boundaries 139 In Chapter 10 we
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5.9 Transformations 141 The modific
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5.10 Formalisation 143 Level 1 Leve
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5.11 Summary 145 Behaviour Requirem
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Chapter 6 Modelling of Concurrent R
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6.2 Concurrency and Synchronisation
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6.3 Communication 157 between proce
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6.3 Communication 159 or to transfo
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6.3 Communication 161 6.3.3.4 Messa
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6.3 Communication 163 Synchronous m
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6.3 Communication 165 channel-name
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6.3 Communication 167 can be descri
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6.3 Communication 169 statement aft
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6.3 Communication 171 (normalCourse
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6.3 Communication 173 ∞ client re
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6.3 Communication 175 There is a gr
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6.3 Communication 177 process A pro
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6.3 Communication 179 Clocks An int
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6.3 Communication 181 whether the s
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6.3 Communication 183 6.3.9.4 Model
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6.3 Communication 185 6.3.10.2 Desc
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6.4 Distribution 187 force to take
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6.4 Distribution 189 is that the in
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6.4 Distribution 191 links to each
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6.4 Distribution 193 6.4.6 Distribu
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6.5 Scenarios 195 entities. This su
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6.5 Scenarios 197 startJob readyToA
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6.5 Scenarios 199 collection of tex
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6.6 Dynamic Behaviour 201 selection
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6.6 Dynamic Behaviour 203 processes
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6.6 Dynamic Behaviour 205 even for
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6.6 Dynamic Behaviour 207 with the
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6.6 Dynamic Behaviour 209 6.6.4 Sep
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6.6 Dynamic Behaviour 211 6.6.5 Mod
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6.6 Dynamic Behaviour 213 to pay at
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6.6 Dynamic Behaviour 215 A method
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Page 251 and 252: 7.2 A Brief Language Characterisati
Page 253 and 254: 7.3 The Role of Semantics 233 7.3 T
Page 255 and 256: 7.4 Mathematical Preliminaries 235
Page 257 and 258: 7.4 Mathematical Preliminaries 237
Page 259 and 260: 7.5 Concluding Remarks 239 0 ¡ Bin
Page 261 and 262: Chapter 8 Data Part of POOSL Chapte
Page 263 and 264: 8.3 Formal Syntax 243 runk, and cun
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Page 273 and 274: 8.6 Primitive deepCopy Messages 253
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Page 277 and 278: 8.7 Example: Complex Numbers 257 is
Page 279 and 280: 8.8 Summary and Concluding Remarks
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Page 283 and 284: 9.3 Formal Syntax 263 In almost any
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Page 317 and 318: 9.7 The Development of POOSL 297 Em
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Page 321 and 322: 9.8 Summary 301 To prepare the deve
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10.5 Example: The Elevator Problem
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10.7 On the Fundamental Limitations
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10.7 On the Fundamental Limitations
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10.8 Summary 331 are transformation
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Chapter 11 SHE Framework Chapter 1
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11.2 SHE Context and Phases 335 Inf
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11.2 SHE Context and Phases 337 a p
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11.2 SHE Context and Phases 339 11.
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11.3 SHE Framework 341 the system.
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11.4 Essential Specification Modell
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11.5 Extended Specification Modelli
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Chapter 12 Case Study Chapter 1 Cha
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12.2 Initial Requirements Descripti
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12.3 The Essential Specification 37
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12.4 Towards an Extended Specificat
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12.5 Concluding Remarks 399 i1 DIST
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12.5 Concluding Remarks 401 Feeder
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Chapter 13 Conclusions and Future W
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13.2 P.H.A. van der Putten’s Cont
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13.2 P.H.A. van der Putten’s Cont
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13.4 Related Results 409 The notion
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Appendix A The POOSL Transition Sys
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A.1 The Data Part of POOSL 413 (12)
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A.2 The Process Part of POOSL 415 A
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A.2 The Process Part of POOSL 417 (
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A.2 The Process Part of POOSL 419 (
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A.2 The Process Part of POOSL 421 i
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Appendix B Proofs of Propositions a
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Proofs of Propositions and Transfor
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Appendix C Glossary of Symbols This
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Glossary of Symbols 437 267 Cp ¥¡
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References [AB90] P. America and F.
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REFERENCES 441 [C [C [C 86] B. Cohe
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REFERENCES 443 [Her90] A.J.H. Herbe
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REFERENCES 445 [MV93] S. Mauw and G
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REFERENCES 447 [vE89] P. van Eijk.
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Index abort, 297 abstract action so
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INDEX 451 strong, 190, 293 subsyste
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INDEX 453 delay, 178 do-statement,
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Summary This combined thesis descri
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Samenvatting Dit gecombineerde proe
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Curricula Vitae Piet van der Putten
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