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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 5261 | . . . 4 ⊢ ∅ ∈ V | |
| 2 | feq1 6679 | . . . 4 ⊢ (𝑒 = ∅ → (𝑒:∅⟶∅ ↔ ∅:∅⟶∅)) | |
| 3 | f0 6755 | . . . 4 ⊢ ∅:∅⟶∅ | |
| 4 | 1, 2, 3 | ceqsexv2d 3500 | . . 3 ⊢ ∃𝑒 𝑒:∅⟶∅ |
| 5 | opabn1stprc 8058 | . . 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 3068 | . . 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 1570 ∃wex 1812 ∉ wnel 3062 Vcvv 3451 ∅c0 4279 {copab 5167 ⟶wf 6527 |
| 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-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pr 5391 ax-un 7740 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-nel 3063 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-fun 6533 df-fn 6534 df-f 6535 |
| This theorem is used by: usgrprc 29829 rgrusgrprc 30152 |
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