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{{TEX|done}}{{MSC|03E}}

A set which contains exactly one element. Notation: $\{ x \}$.  One has $y \in \{ x \} \Leftrightarrow y = x$.

====References====
<table>
<TR><TD valign="top">[1]</TD> <TD valign="top">  P. R. Halmos, ''Naive Set Theory'', Springer (1960) {{ISBN|0-387-90092-6}}</TD></TR>
</table>

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Singleton. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Singleton&oldid=53851

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