Difference between revisions of "Singleton"
From Encyclopedia of Mathematics
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====References==== | ====References==== | ||
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| − | <TR><TD valign="top">[1]</TD> <TD valign="top"> P. R. Halmos, ''Naive Set Theory'', Springer (1960) ISBN 0-387-90092-6</TD></TR> | + | <TR><TD valign="top">[1]</TD> <TD valign="top"> P. R. Halmos, ''Naive Set Theory'', Springer (1960) {{ISBN|0-387-90092-6}}</TD></TR> |
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Latest revision as of 16:19, 22 April 2023
2020 Mathematics Subject Classification: Primary: 03E [MSN][ZBL]
A set which contains exactly one element. Notation: $\{ x \}$. One has $y \in \{ x \} \Leftrightarrow y = x$.
References
| [1] | P. R. Halmos, Naive Set Theory, Springer (1960) ISBN 0-387-90092-6 |
How to Cite This Entry:
Singleton. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Singleton&oldid=53851
Singleton. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Singleton&oldid=53851