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Difference between revisions of "Singleton"

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(Start article: Singleton)
 
 
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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>
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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>
 
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</table>

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