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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 8472 | . 2 ⊢ 1o ∈ V | |
| 2 | 1 | prid2 4734 | 1 ⊢ 1o ∈ {∅, 1o} |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2146 ∅c0 4289 {cpr 4596 1oc1o 8455 |
| 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 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-pr 5409 |
| 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 2745 df-cleq 2758 df-clel 2841 df-v 3460 df-dif 3911 df-un 3913 df-nul 4290 df-sn 4595 df-pr 4597 df-suc 6373 df-1o 8462 |
| This theorem is used by: nlim2 8484 djuss 9925 sadcf 16536 fnpr2ob 17637 setcepi 18170 setc2obas 18176 setc2ohom 18177 efgi1 19816 frgpuptinv 19866 dprdpr 20147 xpstopnlem1 23996 xpstopnlem2 23998 omnord1ex 44064 oege2 44067 oenord1ex 44075 oenord1 44076 oaomoencom 44077 oenassex 44078 omcl3g 44094 clsk1indlem1 44804 |
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