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286 Process Part of POOSL in x Sender Receiver y Figure 9.1: A Simple Handshake Protocol will demonstrate that the protocol behaves as a 1-place buffer. The protocol, consisting of a Sender process and a Receiver process, is visualised in figure 9.1. The Sender can receive some data from channel in and this data is delivered by the Receiver at channel out. Externally the protocol behaves as a 1-place buffer. The protocol is specified as follows: (Sender ¢ Receiver) £ x¥ y¦ ¥ ¥ Sys p Sys ¥ For reasons of simplicity we assume that there are no non-primitive data classes, so Sys . Sysp consists of process classes Sender and Receiver. It is defined as Sysp 7 process class Sender instance variables communication channels in x y message interface in?receive(dS) x!transfer(dS) y?ack initial method call start instance methods start ¡ dS ¡ in?receive(dS); x!transfer(dS); y?ack; start ¡ ¡ process class instance variables Receiver communication channels x y out message interface x?transfer(dR) out!deliver(dR) y!ack initial method call start instance methods start dR x?transfer(dR); out!deliver(dR); y!ack; start Configuration ¢ (Sender Receiver) £ ¥ x¥ y¦ ¥ Sysp ¥ Sys reflects the state of the protocol where both the sender and the receiver are not initialised yet. The actual computation starts by initialising either the sender or the receiver. By axiom (8’) we have Sys ¥ Sender¥ p ¥ Sys £ £ Sender £ ¤ ¦ ¥ ¥ proc start § ¥ ¤ ¥ Sys p ¥ Sys 7 The specifications and configurations use some obvious syntactic simplifications. ou t
9.6 Example: A Simple Handshake Protocol 287 Using rule (s’) we then deduce ¢ ¥ Receiver¥ Sender Sysp Sys £ £ ¥ proc £ ¤ ¦ ¥ ¥ ¤ ¥ Sys start § ¢ Receiver¥ Sender p Sys ¥ and thus by rule (v’) £ x¥ y¦ ¥ ¥ ¢ (Sender Receiver) Sysp ¥ Sys £ ¢ (start § Sender Receiver) £ £ proc £ ¤ ¦ ¥ ¥ ¤ ¥ Sys x¥ y¦ ¥ p Sys ¥ By applying axiom (4’) and rules (s’),(v’) we get § (start ¢ Sender Receiver) £ £ proc £ ¤ ¦ ¥ ¥ ¤ ¥ Sys x¥ y¦ ¥ p ¥ Sys £ start) ¢ (§ start (in?receive(dS); x!transfer(dS); y?ack; Sender Receiver) £ £ £ ¥ proc¥ proc £ nil¦ ¥ ¤ ¥ £ ¤ ¦ dS Sysp ¥ Sys The latter configuration reflects the situation where the receiver is able to receive message receive and data dS from channel in, and where the receiver is still uninitialised. If we let the receiver perform its message reception we get, by applying axiom (3’) and rules (b’),(s’),(v’) (§ start) ¢ start (in?receive(dS); x!transfer(dS); y?ack; Sender Receiver) £ £ £ ¥ proc¥ proc £ ¤ ¦ ¢ (§ start) start (x!transfer(dS); y?ack; Sender Receiver) £ dS £ nil¦ ¥ ¤ ¥ Sys p ¥ Sys data¤ ¤ £ in?receive£ y¦ ¥ x¥ x¥ y¦ ¥ x¥ y¦ ¥ £ £ £ ¥ ¥ proc dS £ ¤ ¦ ¥ proc¥ Sys ¦ ¤ p Sys ¥ Here, data ¥ for ¤ PDObj. This can be ¥ ¤ seen as ¡ ¡ ¡ 1 ¥ 1¥ ¡ ¤ some primitive data object follows: According to axiom (3’), data should be of the form 1 Struc1 Sys£ we have by (2) of the definition of Sys-structures that Dom( min. Since Sys ¡ ¤ ¤ ¤ Dom(¡ ¡ ¤ Dom(¡ ¡ Dom(¡ , and therefore by (1) of the same definition that 1 NDObj) = 1) . By Proposition 1(c) we know that proc 1) and thus 1) = . Now according to (4) of the definition of Sys-structures ¤ 1 ¡ NDObj implies ¤ 1 ¡ Dom(¡ 1). Therefore ¤ 1 ¡ PDObj and thus thus data is of the form ¥ ¤ ¥ ¤ . If we continue calculating the transitions between the involved configurations we construct a so-called transition graph, shown in Figure 9.2, representing the behaviour of the protocol. The transition graph consists of 18 configurations (represented by the nodes of the graph), some of which are parameterised. ¡ The mark attached to node conf p 1 denotes that this is the starting configuration. The § © substitution ¥¡ © S R indicates that parameters S and R of conf p 18( ¥ S R ) have to be replaced by and respectively. Substitution has a similar meaning. Further, a? denotes receive action in?receive§ ¥ ¤ ¥ ¤ and § ©¢ a! out!deliver§ ¥ ¤ ¥ ¤ denotes send action . Note that, although the graph of Figure 9.2 has a finite amount of nodes, it represents an infinite transition graph. Node conf p 7 ( ), for example, represents a collection of nodes, one for ¡ each PDObj. The configurations are given by
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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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6.6 Dynamic Behaviour 217 to happen
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6.6 Dynamic Behaviour 219 c a Multi
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6.6 Dynamic Behaviour 221 but not t
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6.7 Real-Time Modelling 223 claimed
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6.7 Real-Time Modelling 225 in the
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6.8 Summary 227 They can graphicall
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Chapter 7 Introduction to the Seman
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7.2 A Brief Language Characterisati
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7.3 The Role of Semantics 233 7.3 T
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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
Page 265 and 266: 8.4 Context Conditions 245 Further,
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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
Page 281 and 282: Chapter 9 Process Part of POOSL Cha
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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Page 351 and 352: 10.8 Summary 331 are transformation
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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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