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subsingleton [2014/11/05 21:46] nikolaj |
subsingleton [2014/11/05 21:49] nikolaj |
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==== Discussion ==== | ==== Discussion ==== | ||
- | A subsingleton is the empty set or a singleton. | + | In classical (non-constructive) set theory, a subsingleton is the empty set or a singleton. |
=== Reference === | === Reference === | ||
==== Parents ==== | ==== Parents ==== | ||
=== Requirements === | === Requirements === | ||
- | [[Set theory]] | + | [[Set universe]] |