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| Mirrors > Home > ILE Home > Th. List > 0elpw | GIF version | ||
| Description: Every power class contains the empty set. (Contributed by NM, 25-Oct-2007.) |
| Ref | Expression |
|---|---|
| 0elpw | ⊢ ∅ ∈ 𝒫 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ss 3561 | . 2 ⊢ ∅ ⊆ 𝐴 | |
| 2 | 0ex 4258 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | elpw 3694 | . 2 ⊢ (∅ ∈ 𝒫 𝐴 ↔ ∅ ⊆ 𝐴) |
| 4 | 1, 3 | mpbir 146 | 1 ⊢ ∅ ∈ 𝒫 𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2209 ⊆ wss 3220 ∅c0 3520 𝒫 cpw 3688 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-nul 4257 |
| This theorem depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-dif 3222 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 |
| This theorem is referenced by: ordpwsucexmid 4715 pw1on 7579 pw1ne0 7581 ssenneg 11263 eupth2lemsfi 16702 pw1nct 17016 exmidpeirce 17020 |
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