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| Mirrors > Home > MPE Home > Th. List > 1oelpr | Structured version Visualization version GIF version | ||
| Description: 1o is an element of {∅, 1o}. (Contributed by Umit Teoman Dogan, 10-Jun-2026.) |
| Ref | Expression |
|---|---|
| 1oelpr | ⊢ 1o ∈ {∅, 1o} |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1oex 8470 | . 2 ⊢ 1o ∈ V | |
| 2 | 1 | prid2 4724 | 1 ⊢ 1o ∈ {∅, 1o} |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 ∅c0 4279 {cpr 4586 1oc1o 8453 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 ax-sep 5249 ax-pr 5391 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-v 3453 df-dif 3902 df-un 3904 df-nul 4280 df-sn 4585 df-pr 4587 df-suc 6361 df-1o 8460 |
| This theorem is used by: nlim2 8482 djuss 9979 sadcf 16600 fnpr2ob 17707 setcepi 18240 setc2obas 18246 setc2ohom 18247 degenmgm 19114 degenmgm2 19117 efgi1 19912 frgpuptinv 19962 dprdpr 20243 xpstopnlem1 24105 xpstopnlem2 24107 omnord1ex 44261 oege2 44264 oenord1ex 44272 oenord1 44273 oaomoencom 44274 oenassex 44275 omcl3g 44291 clsk1indlem1 45001 |
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