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Mirrors > Home > MPE Home > Th. List > 1hegrvtxdg1 | Structured version Visualization version GIF version |
Description: The vertex degree of a graph with one hyperedge, case 2: an edge from the given vertex to some other vertex contributes one to the vertex's degree. (Contributed by Mario Carneiro, 12-Mar-2015.) (Revised by Alexander van der Vekens, 22-Dec-2017.) (Revised by AV, 23-Feb-2021.) |
Ref | Expression |
---|---|
1hegrvtxdg1.a | ⊢ (𝜑 → 𝐴 ∈ 𝑋) |
1hegrvtxdg1.b | ⊢ (𝜑 → 𝐵 ∈ 𝑉) |
1hegrvtxdg1.c | ⊢ (𝜑 → 𝐶 ∈ 𝑉) |
1hegrvtxdg1.n | ⊢ (𝜑 → 𝐵 ≠ 𝐶) |
1hegrvtxdg1.x | ⊢ (𝜑 → 𝐸 ∈ 𝒫 𝑉) |
1hegrvtxdg1.i | ⊢ (𝜑 → (iEdg‘𝐺) = {〈𝐴, 𝐸〉}) |
1hegrvtxdg1.e | ⊢ (𝜑 → {𝐵, 𝐶} ⊆ 𝐸) |
1hegrvtxdg1.v | ⊢ (𝜑 → (Vtx‘𝐺) = 𝑉) |
Ref | Expression |
---|---|
1hegrvtxdg1 | ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝐵) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1hegrvtxdg1.i | . 2 ⊢ (𝜑 → (iEdg‘𝐺) = {〈𝐴, 𝐸〉}) | |
2 | 1hegrvtxdg1.v | . 2 ⊢ (𝜑 → (Vtx‘𝐺) = 𝑉) | |
3 | 1hegrvtxdg1.a | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝑋) | |
4 | 1hegrvtxdg1.b | . 2 ⊢ (𝜑 → 𝐵 ∈ 𝑉) | |
5 | 1hegrvtxdg1.x | . 2 ⊢ (𝜑 → 𝐸 ∈ 𝒫 𝑉) | |
6 | 1hegrvtxdg1.e | . . 3 ⊢ (𝜑 → {𝐵, 𝐶} ⊆ 𝐸) | |
7 | prid1g 4762 | . . . 4 ⊢ (𝐵 ∈ 𝑉 → 𝐵 ∈ {𝐵, 𝐶}) | |
8 | 4, 7 | syl 17 | . . 3 ⊢ (𝜑 → 𝐵 ∈ {𝐵, 𝐶}) |
9 | 6, 8 | sseldd 3981 | . 2 ⊢ (𝜑 → 𝐵 ∈ 𝐸) |
10 | 1hegrvtxdg1.c | . . . . 5 ⊢ (𝜑 → 𝐶 ∈ 𝑉) | |
11 | prid2g 4763 | . . . . 5 ⊢ (𝐶 ∈ 𝑉 → 𝐶 ∈ {𝐵, 𝐶}) | |
12 | 10, 11 | syl 17 | . . . 4 ⊢ (𝜑 → 𝐶 ∈ {𝐵, 𝐶}) |
13 | 6, 12 | sseldd 3981 | . . 3 ⊢ (𝜑 → 𝐶 ∈ 𝐸) |
14 | 1hegrvtxdg1.n | . . 3 ⊢ (𝜑 → 𝐵 ≠ 𝐶) | |
15 | 5, 9, 13, 14 | nehash2 14430 | . 2 ⊢ (𝜑 → 2 ≤ (♯‘𝐸)) |
16 | 1, 2, 3, 4, 5, 9, 15 | 1hevtxdg1 28742 | 1 ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝐵) = 1) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ⊆ wss 3946 𝒫 cpw 4600 {csn 4626 {cpr 4628 〈cop 4632 ‘cfv 6539 1c1 11106 Vtxcvtx 28235 iEdgciedg 28236 VtxDegcvtxdg 28701 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5283 ax-sep 5297 ax-nul 5304 ax-pow 5361 ax-pr 5425 ax-un 7719 ax-cnex 11161 ax-resscn 11162 ax-1cn 11163 ax-icn 11164 ax-addcl 11165 ax-addrcl 11166 ax-mulcl 11167 ax-mulrcl 11168 ax-mulcom 11169 ax-addass 11170 ax-mulass 11171 ax-distr 11172 ax-i2m1 11173 ax-1ne0 11174 ax-1rid 11175 ax-rnegex 11176 ax-rrecex 11177 ax-cnre 11178 ax-pre-lttri 11179 ax-pre-lttrn 11180 ax-pre-ltadd 11181 ax-pre-mulgt0 11182 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3776 df-csb 3892 df-dif 3949 df-un 3951 df-in 3953 df-ss 3963 df-pss 3965 df-nul 4321 df-if 4527 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4907 df-int 4949 df-iun 4997 df-br 5147 df-opab 5209 df-mpt 5230 df-tr 5264 df-id 5572 df-eprel 5578 df-po 5586 df-so 5587 df-fr 5629 df-we 5631 df-xp 5680 df-rel 5681 df-cnv 5682 df-co 5683 df-dm 5684 df-rn 5685 df-res 5686 df-ima 5687 df-pred 6296 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6491 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-riota 7359 df-ov 7406 df-oprab 7407 df-mpo 7408 df-om 7850 df-1st 7969 df-2nd 7970 df-frecs 8260 df-wrecs 8291 df-recs 8365 df-rdg 8404 df-1o 8460 df-oadd 8464 df-er 8698 df-en 8935 df-dom 8936 df-sdom 8937 df-fin 8938 df-dju 9891 df-card 9929 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11441 df-neg 11442 df-nn 12208 df-2 12270 df-n0 12468 df-xnn0 12540 df-z 12554 df-uz 12818 df-xadd 13088 df-fz 13480 df-hash 14286 df-vtxdg 28702 |
This theorem is referenced by: 1hegrvtxdg1r 28744 eupth2lem3lem4 29463 |
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