Definition:Collection
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Definition
A collection is an aggregation of objects whose nature is arbitrary.
The precise nature and structure of the collection itself is left unspecified.
Hence the word collection can be conveniently used for an aggregation which may be either a set or a class, and such that whatever is being said about it applies to both.
Sources
- 1996: H. Jerome Keisler and Joel Robbin: Mathematical Logic and Computability ... (previous) ... (next): Appendix $\text A$: Sets and Functions: $\text{A}.1$: Sets
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $2$: Some Basics of Class-Set Theory