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| Mirrors > Home > MPE Home > Th. List > griedg0prc | Structured version Visualization version GIF version | ||
| Description: The class of empty graphs (represented as ordered pairs) is a proper class. (Contributed by AV, 27-Dec-2020.) |
| Ref | Expression |
|---|---|
| griedg0prc.u | ⊢ 𝑈 = {〈𝑣, 𝑒〉 ∣ 𝑒:∅⟶∅} |
| Ref | Expression |
|---|---|
| griedg0prc | ⊢ 𝑈 ∉ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ex 5260 | . . . 4 ⊢ ∅ ∈ V | |
| 2 | feq1 6688 | . . . 4 ⊢ (𝑒 = ∅ → (𝑒:∅⟶∅ ↔ ∅:∅⟶∅)) | |
| 3 | f0 6764 | . . . 4 ⊢ ∅:∅⟶∅ | |
| 4 | 1, 2, 3 | ceqsexv2d 3499 | . . 3 ⊢ ∃𝑒 𝑒:∅⟶∅ |
| 5 | opabn1stprc 8070 | . . 3 ⊢ (∃𝑒 𝑒:∅⟶∅ → {〈𝑣, 𝑒〉 ∣ 𝑒:∅⟶∅} ∉ V) | |
| 6 | 4, 5 | ax-mp 5 | . 2 ⊢ {〈𝑣, 𝑒〉 ∣ 𝑒:∅⟶∅} ∉ V |
| 7 | griedg0prc.u | . . 3 ⊢ 𝑈 = {〈𝑣, 𝑒〉 ∣ 𝑒:∅⟶∅} | |
| 8 | neleq1 3067 | . . 3 ⊢ (𝑈 = {〈𝑣, 𝑒〉 ∣ 𝑒:∅⟶∅} → (𝑈 ∉ V ↔ {〈𝑣, 𝑒〉 ∣ 𝑒:∅⟶∅} ∉ V)) | |
| 9 | 7, 8 | ax-mp 5 | . 2 ⊢ (𝑈 ∉ V ↔ {〈𝑣, 𝑒〉 ∣ 𝑒:∅⟶∅} ∉ V) |
| 10 | 6, 9 | mpbir 234 | 1 ⊢ 𝑈 ∉ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 = wceq 1569 ∃wex 1811 ∉ wnel 3061 Vcvv 3450 ∅c0 4278 {copab 5166 ⟶wf 6535 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7752 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-nel 3062 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-fun 6541 df-fn 6542 df-f 6543 |
| This theorem is used by: usgrprc 29853 rgrusgrprc 30176 |
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