Integrated generic resource: Classification and set theory ISO 10303-54:2005(E)
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Cover page
Table of contents
Copyright
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviations

4 Classification
   4.1 Introduction
   4.2 Fundamental concepts and assumptions
   4.3 Classification type definitions
   4.4 Classification entity definitions
   4.5 Classification subtype constraint definitions
5 Set theory
   5.1 Introduction
   5.2 Fundamental concepts and assumptions
   5.3 Set theory entity definitions
   5.4 Set theory function definitions

A Short names of entities
B Information object registration
C Computer interpretable listings
D EXPRESS-G diagrams
Index

3 Terms and definitions

3.1 Terms defined in ISO 10303-1

For the purposes of this document, the following terms defined in ISO 10303-1 apply:

3.2 Other terms and definitions

For the purposes of this document, the following definitions apply:

3.2.1
set; class

number of things considered together

NOTE 1   A set that is defined by enumerating its members is a 'class by intension'.

NOTE 2   A set that is defined by means of criteria that do not enumerate the members is a 'class by extension'.

3.3 Abbreviations

For the purposes of this document, the following abbreviations apply:

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