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Mirrors > Home > MPE Home > Th. List > 1hegrvtxdg1r | Structured version Visualization version GIF version |
Description: The vertex degree of a graph with one hyperedge, case 3: an edge from some other vertex to the given 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 |
---|---|
1hegrvtxdg1r | ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝐶) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1hegrvtxdg1.a | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝑋) | |
2 | 1hegrvtxdg1.c | . 2 ⊢ (𝜑 → 𝐶 ∈ 𝑉) | |
3 | 1hegrvtxdg1.b | . 2 ⊢ (𝜑 → 𝐵 ∈ 𝑉) | |
4 | 1hegrvtxdg1.n | . . 3 ⊢ (𝜑 → 𝐵 ≠ 𝐶) | |
5 | 4 | necomd 3068 | . 2 ⊢ (𝜑 → 𝐶 ≠ 𝐵) |
6 | 1hegrvtxdg1.x | . 2 ⊢ (𝜑 → 𝐸 ∈ 𝒫 𝑉) | |
7 | 1hegrvtxdg1.i | . 2 ⊢ (𝜑 → (iEdg‘𝐺) = {〈𝐴, 𝐸〉}) | |
8 | prcom 4660 | . . 3 ⊢ {𝐶, 𝐵} = {𝐵, 𝐶} | |
9 | 1hegrvtxdg1.e | . . 3 ⊢ (𝜑 → {𝐵, 𝐶} ⊆ 𝐸) | |
10 | 8, 9 | eqsstrid 4012 | . 2 ⊢ (𝜑 → {𝐶, 𝐵} ⊆ 𝐸) |
11 | 1hegrvtxdg1.v | . 2 ⊢ (𝜑 → (Vtx‘𝐺) = 𝑉) | |
12 | 1, 2, 3, 5, 6, 7, 10, 11 | 1hegrvtxdg1 27216 | 1 ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝐶) = 1) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1528 ∈ wcel 2105 ≠ wne 3013 ⊆ wss 3933 𝒫 cpw 4535 {csn 4557 {cpr 4559 〈cop 4563 ‘cfv 6348 1c1 10526 Vtxcvtx 26708 iEdgciedg 26709 VtxDegcvtxdg 27174 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-rep 5181 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7450 ax-cnex 10581 ax-resscn 10582 ax-1cn 10583 ax-icn 10584 ax-addcl 10585 ax-addrcl 10586 ax-mulcl 10587 ax-mulrcl 10588 ax-mulcom 10589 ax-addass 10590 ax-mulass 10591 ax-distr 10592 ax-i2m1 10593 ax-1ne0 10594 ax-1rid 10595 ax-rnegex 10596 ax-rrecex 10597 ax-cnre 10598 ax-pre-lttri 10599 ax-pre-lttrn 10600 ax-pre-ltadd 10601 ax-pre-mulgt0 10602 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3or 1080 df-3an 1081 df-tru 1531 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-ne 3014 df-nel 3121 df-ral 3140 df-rex 3141 df-reu 3142 df-rmo 3143 df-rab 3144 df-v 3494 df-sbc 3770 df-csb 3881 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-pss 3951 df-nul 4289 df-if 4464 df-pw 4537 df-sn 4558 df-pr 4560 df-tp 4562 df-op 4564 df-uni 4831 df-int 4868 df-iun 4912 df-br 5058 df-opab 5120 df-mpt 5138 df-tr 5164 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-riota 7103 df-ov 7148 df-oprab 7149 df-mpo 7150 df-om 7570 df-1st 7678 df-2nd 7679 df-wrecs 7936 df-recs 7997 df-rdg 8035 df-1o 8091 df-oadd 8095 df-er 8278 df-en 8498 df-dom 8499 df-sdom 8500 df-fin 8501 df-dju 9318 df-card 9356 df-pnf 10665 df-mnf 10666 df-xr 10667 df-ltxr 10668 df-le 10669 df-sub 10860 df-neg 10861 df-nn 11627 df-2 11688 df-n0 11886 df-xnn0 11956 df-z 11970 df-uz 12232 df-xadd 12496 df-fz 12881 df-hash 13679 df-vtxdg 27175 |
This theorem is referenced by: eupth2lem3lem4 27937 |
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