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| Mirrors > Home > MPE Home > Th. List > snid | Structured version Visualization version GIF version | ||
| Description: A set is a member of its singleton. Part of Theorem 7.6 of [Quine] p. 49. (Contributed by NM, 31-Dec-1993.) |
| Ref | Expression |
|---|---|
| snid.1 | ⊢ 𝐴 ∈ V |
| Ref | Expression |
|---|---|
| snid | ⊢ 𝐴 ∈ {𝐴} |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snid.1 | . 2 ⊢ 𝐴 ∈ V | |
| 2 | snidb 4643 | . 2 ⊢ (𝐴 ∈ V ↔ 𝐴 ∈ {𝐴}) | |
| 3 | 1, 2 | mpbi 230 | 1 ⊢ 𝐴 ∈ {𝐴} |
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