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| Mirrors > Home > ILE Home > Th. List > 2oex | GIF version | ||
| Description: 2o is a set. (Contributed by BJ, 6-Apr-2019.) (Proof shortened by Zhi Wang, 19-Sep-2024.) |
| Ref | Expression |
|---|---|
| 2oex | ⊢ 2o ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df2o3 6661 | . 2 ⊢ 2o = {∅, 1o} | |
| 2 | 0ex 4236 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 1oex 6654 | . . 3 ⊢ 1o ∈ V | |
| 4 | prexg 4324 | . . 3 ⊢ ((∅ ∈ V ∧ 1o ∈ V) → {∅, 1o} ∈ V) | |
| 5 | 2, 3, 4 | mp2an 426 | . 2 ⊢ {∅, 1o} ∈ V |
| 6 | 1, 5 | eqeltri 2305 | 1 ⊢ 2o ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2203 Vcvv 2812 ∅c0 3507 {cpr 3689 1oc1o 6639 2oc2o 6640 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4227 ax-nul 4235 ax-pow 4286 ax-pr 4321 ax-un 4553 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ral 2525 df-rex 2526 df-v 2814 df-dif 3212 df-un 3214 df-in 3216 df-ss 3223 df-nul 3508 df-pw 3670 df-sn 3694 df-pr 3695 df-uni 3914 df-tr 4208 df-iord 4486 df-on 4488 df-suc 4491 df-1o 6646 df-2o 6647 |
| This theorem is referenced by: (None) |
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