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| Mirrors > Home > MPE Home > Th. List > snidg | Structured version Visualization version Unicode version | ||
| Description: A set is a member of its singleton. Part of Theorem 7.6 of [Quine] p. 49. (Contributed by NM, 28-Oct-2003.) |
| Ref | Expression |
|---|---|
| snidg |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2622 |
. 2
| |
| 2 | elsng 4191 |
. 2
| |
| 3 | 1, 2 | mpbiri 248 |
1
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