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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 6696 | . 2 ⊢ 2o = {∅, 1o} | |
| 2 | 0ex 4258 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 1oex 6689 | . . 3 ⊢ 1o ∈ V | |
| 4 | prexg 4347 | . . 3 ⊢ ((∅ ∈ V ∧ 1o ∈ V) → {∅, 1o} ∈ V) | |
| 5 | 2, 3, 4 | mp2an 430 | . 2 ⊢ {∅, 1o} ∈ V |
| 6 | 1, 5 | eqeltri 2311 | 1 ⊢ 2o ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2209 Vcvv 2821 ∅c0 3520 {cpr 3709 1oc1o 6674 2oc2o 6675 |
| 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-14 2212 ax-ext 2220 ax-sep 4247 ax-nul 4257 ax-pow 4309 ax-pr 4344 ax-un 4576 |
| 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-ral 2533 df-rex 2534 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3714 df-pr 3715 df-uni 3934 df-tr 4228 df-iord 4509 df-on 4511 df-suc 4514 df-1o 6681 df-2o 6682 |
| This theorem is referenced by: (None) |
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