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| Mirrors > Home > MPE Home > Th. List > nbgr0edglem | Structured version Visualization version GIF version | ||
| Description: Lemma for nbgr0edg 29995 and nbgr1vtx 29996. (Contributed by AV, 15-Nov-2020.) |
| Ref | Expression |
|---|---|
| nbgr0edglem.v | ⊢ (𝜑 → ∀𝑛 ∈ ((Vtx‘𝐺) ∖ {𝐾}) ¬ ∃𝑒 ∈ (Edg‘𝐺){𝐾, 𝑛} ⊆ 𝑒) |
| Ref | Expression |
|---|---|
| nbgr0edglem | ⊢ (𝜑 → (𝐺 NeighbVtx 𝐾) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2763 | . . . . . . . 8 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺) | |
| 2 | eqid 2763 | . . . . . . . 8 ⊢ (Edg‘𝐺) = (Edg‘𝐺) | |
| 3 | 1, 2 | nbgrval 29974 | . . . . . . 7 ⊢ (𝐾 ∈ (Vtx‘𝐺) → (𝐺 NeighbVtx 𝐾) = {𝑛 ∈ ((Vtx‘𝐺) ∖ {𝐾}) ∣ ∃𝑒 ∈ (Edg‘𝐺){𝐾, 𝑛} ⊆ 𝑒}) |
| 4 | 3 | ad2antrl 741 | . . . . . 6 ⊢ (((𝐺 ∈ V ∧ 𝐾 ∈ V) ∧ (𝐾 ∈ (Vtx‘𝐺) ∧ 𝜑)) → (𝐺 NeighbVtx 𝐾) = {𝑛 ∈ ((Vtx‘𝐺) ∖ {𝐾}) ∣ ∃𝑒 ∈ (Edg‘𝐺){𝐾, 𝑛} ⊆ 𝑒}) |
| 5 | nbgr0edglem.v | . . . . . . . 8 ⊢ (𝜑 → ∀𝑛 ∈ ((Vtx‘𝐺) ∖ {𝐾}) ¬ ∃𝑒 ∈ (Edg‘𝐺){𝐾, 𝑛} ⊆ 𝑒) | |
| 6 | 5 | ad2antll 742 | . . . . . . 7 ⊢ (((𝐺 ∈ V ∧ 𝐾 ∈ V) ∧ (𝐾 ∈ (Vtx‘𝐺) ∧ 𝜑)) → ∀𝑛 ∈ ((Vtx‘𝐺) ∖ {𝐾}) ¬ ∃𝑒 ∈ (Edg‘𝐺){𝐾, 𝑛} ⊆ 𝑒) |
| 7 | rabeq0 4341 | . . . . . . 7 ⊢ ({𝑛 ∈ ((Vtx‘𝐺) ∖ {𝐾}) ∣ ∃𝑒 ∈ (Edg‘𝐺){𝐾, 𝑛} ⊆ 𝑒} = ∅ ↔ ∀𝑛 ∈ ((Vtx‘𝐺) ∖ {𝐾}) ¬ ∃𝑒 ∈ (Edg‘𝐺){𝐾, 𝑛} ⊆ 𝑒) | |
| 8 | 6, 7 | sylibr 237 | . . . . . 6 ⊢ (((𝐺 ∈ V ∧ 𝐾 ∈ V) ∧ (𝐾 ∈ (Vtx‘𝐺) ∧ 𝜑)) → {𝑛 ∈ ((Vtx‘𝐺) ∖ {𝐾}) ∣ ∃𝑒 ∈ (Edg‘𝐺){𝐾, 𝑛} ⊆ 𝑒} = ∅) |
| 9 | 4, 8 | eqtrd 2798 | . . . . 5 ⊢ (((𝐺 ∈ V ∧ 𝐾 ∈ V) ∧ (𝐾 ∈ (Vtx‘𝐺) ∧ 𝜑)) → (𝐺 NeighbVtx 𝐾) = ∅) |
| 10 | 9 | expcom 419 | . . . 4 ⊢ ((𝐾 ∈ (Vtx‘𝐺) ∧ 𝜑) → ((𝐺 ∈ V ∧ 𝐾 ∈ V) → (𝐺 NeighbVtx 𝐾) = ∅)) |
| 11 | 10 | ex 418 | . . 3 ⊢ (𝐾 ∈ (Vtx‘𝐺) → (𝜑 → ((𝐺 ∈ V ∧ 𝐾 ∈ V) → (𝐺 NeighbVtx 𝐾) = ∅))) |
| 12 | 11 | com23 87 | . 2 ⊢ (𝐾 ∈ (Vtx‘𝐺) → ((𝐺 ∈ V ∧ 𝐾 ∈ V) → (𝜑 → (𝐺 NeighbVtx 𝐾) = ∅))) |
| 13 | df-nel 3066 | . . . 4 ⊢ (𝐾 ∉ (Vtx‘𝐺) ↔ ¬ 𝐾 ∈ (Vtx‘𝐺)) | |
| 14 | 1 | nbgrnvtx0 29977 | . . . 4 ⊢ (𝐾 ∉ (Vtx‘𝐺) → (𝐺 NeighbVtx 𝐾) = ∅) |
| 15 | 13, 14 | sylbir 238 | . . 3 ⊢ (¬ 𝐾 ∈ (Vtx‘𝐺) → (𝐺 NeighbVtx 𝐾) = ∅) |
| 16 | 15 | a1d 26 | . 2 ⊢ (¬ 𝐾 ∈ (Vtx‘𝐺) → (𝜑 → (𝐺 NeighbVtx 𝐾) = ∅)) |
| 17 | nbgrprc0 29972 | . . 3 ⊢ (¬ (𝐺 ∈ V ∧ 𝐾 ∈ V) → (𝐺 NeighbVtx 𝐾) = ∅) | |
| 18 | 17 | a1d 26 | . 2 ⊢ (¬ (𝐺 ∈ V ∧ 𝐾 ∈ V) → (𝜑 → (𝐺 NeighbVtx 𝐾) = ∅)) |
| 19 | 12, 16, 18 | pm2.61nii 186 | 1 ⊢ (𝜑 → (𝐺 NeighbVtx 𝐾) = ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2147 ∉ wnel 3065 ∀wral 3080 ∃wrex 3090 {crab 3416 Vcvv 3454 ⊆ wss 3900 ∖ cdif 4048 ∅c0 4281 {csn 4588 {cpr 4590 ‘cfv 6566 (class class class)co 7451 Vtxcvtx 29631 Edgcedg 29682 NeighbVtx cnbgr 29970 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pr 5398 ax-un 7783 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-id 5553 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-iota 6520 df-fun 6568 df-fv 6574 df-ov 7454 df-oprab 7455 df-mpo 7456 df-1st 8035 df-2nd 8036 df-nbgr 29971 |
| This theorem is used by: nbgr0edg 29995 nbgr1vtx 29996 |
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