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| Mirrors > Home > MPE Home > Th. List > nbgr0edglem | Structured version Visualization version GIF version | ||
| Description: Lemma for nbgr0edg 29938 and nbgr1vtx 29939. (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 2761 | . . . . . . . 8 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺) | |
| 2 | eqid 2761 | . . . . . . . 8 ⊢ (Edg‘𝐺) = (Edg‘𝐺) | |
| 3 | 1, 2 | nbgrval 29917 | . . . . . . 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 4338 | . . . . . . 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 2796 | . . . . 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 3063 | . . . 4 ⊢ (𝐾 ∉ (Vtx‘𝐺) ↔ ¬ 𝐾 ∈ (Vtx‘𝐺)) | |
| 14 | 1 | nbgrnvtx0 29920 | . . . 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 29915 | . . 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 2145 ∉ wnel 3062 ∀wral 3077 ∃wrex 3087 {crab 3413 Vcvv 3451 ∖ cdif 3896 ⊆ wss 3899 ∅c0 4279 {csn 4584 {cpr 4586 ‘cfv 6538 (class class class)co 7420 Vtxcvtx 29574 Edgcedg 29625 NeighbVtx cnbgr 29913 |
| 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 7751 |
| 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-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6494 df-fun 6540 df-fv 6546 df-ov 7423 df-oprab 7424 df-mpo 7425 df-1st 8001 df-2nd 8002 df-nbgr 29914 |
| This theorem is used by: nbgr0edg 29938 nbgr1vtx 29939 |
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