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4.4.  Membership

For any set S and any object x, either x is a member of S or it is not.

In order to indicate that x is a member of S, we write x [isin] S
x [isin] S is a shorthand for: x is a member of S.

In order to indicate that x is not a member of S, we write x [notin] S
x [notin] S is a shorthand for: x is not a member of S.

Examples: The following are true statements


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Created by unroff & hp-tools. © by Hans-Peter Bischof. All Rights Reserved (1998).

Last modified: 27/July/98 (12:14)