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Mirrors > Home > MPE Home > Th. List > umgredg | Structured version Visualization version GIF version |
Description: For each edge in a multigraph, there are two distinct vertices which are connected by this edge. (Contributed by Alexander van der Vekens, 9-Dec-2017.) (Revised by AV, 25-Nov-2020.) |
Ref | Expression |
---|---|
upgredg.v | ⊢ 𝑉 = (Vtx‘𝐺) |
upgredg.e | ⊢ 𝐸 = (Edg‘𝐺) |
Ref | Expression |
---|---|
umgredg | ⊢ ((𝐺 ∈ UMGraph ∧ 𝐶 ∈ 𝐸) → ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏})) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | upgredg.e | . . . . 5 ⊢ 𝐸 = (Edg‘𝐺) | |
2 | 1 | eleq2i 2904 | . . . 4 ⊢ (𝐶 ∈ 𝐸 ↔ 𝐶 ∈ (Edg‘𝐺)) |
3 | edgumgr 26914 | . . . 4 ⊢ ((𝐺 ∈ UMGraph ∧ 𝐶 ∈ (Edg‘𝐺)) → (𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2)) | |
4 | 2, 3 | sylan2b 595 | . . 3 ⊢ ((𝐺 ∈ UMGraph ∧ 𝐶 ∈ 𝐸) → (𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2)) |
5 | hash2prde 13822 | . . . 4 ⊢ ((𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2) → ∃𝑎∃𝑏(𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏})) | |
6 | eleq1 2900 | . . . . . . . . . 10 ⊢ (𝐶 = {𝑎, 𝑏} → (𝐶 ∈ 𝒫 (Vtx‘𝐺) ↔ {𝑎, 𝑏} ∈ 𝒫 (Vtx‘𝐺))) | |
7 | prex 5324 | . . . . . . . . . . . 12 ⊢ {𝑎, 𝑏} ∈ V | |
8 | 7 | elpw 4545 | . . . . . . . . . . 11 ⊢ ({𝑎, 𝑏} ∈ 𝒫 (Vtx‘𝐺) ↔ {𝑎, 𝑏} ⊆ (Vtx‘𝐺)) |
9 | vex 3497 | . . . . . . . . . . . . 13 ⊢ 𝑎 ∈ V | |
10 | vex 3497 | . . . . . . . . . . . . 13 ⊢ 𝑏 ∈ V | |
11 | 9, 10 | prss 4746 | . . . . . . . . . . . 12 ⊢ ((𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ↔ {𝑎, 𝑏} ⊆ 𝑉) |
12 | upgredg.v | . . . . . . . . . . . . 13 ⊢ 𝑉 = (Vtx‘𝐺) | |
13 | 12 | sseq2i 3995 | . . . . . . . . . . . 12 ⊢ ({𝑎, 𝑏} ⊆ 𝑉 ↔ {𝑎, 𝑏} ⊆ (Vtx‘𝐺)) |
14 | 11, 13 | sylbbr 238 | . . . . . . . . . . 11 ⊢ ({𝑎, 𝑏} ⊆ (Vtx‘𝐺) → (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) |
15 | 8, 14 | sylbi 219 | . . . . . . . . . 10 ⊢ ({𝑎, 𝑏} ∈ 𝒫 (Vtx‘𝐺) → (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) |
16 | 6, 15 | syl6bi 255 | . . . . . . . . 9 ⊢ (𝐶 = {𝑎, 𝑏} → (𝐶 ∈ 𝒫 (Vtx‘𝐺) → (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉))) |
17 | 16 | adantrd 494 | . . . . . . . 8 ⊢ (𝐶 = {𝑎, 𝑏} → ((𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2) → (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉))) |
18 | 17 | adantl 484 | . . . . . . 7 ⊢ ((𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏}) → ((𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2) → (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉))) |
19 | 18 | imdistanri 572 | . . . . . 6 ⊢ (((𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2) ∧ (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏})) → ((𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ∧ (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏}))) |
20 | 19 | ex 415 | . . . . 5 ⊢ ((𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2) → ((𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏}) → ((𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ∧ (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏})))) |
21 | 20 | 2eximdv 1916 | . . . 4 ⊢ ((𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2) → (∃𝑎∃𝑏(𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏}) → ∃𝑎∃𝑏((𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ∧ (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏})))) |
22 | 5, 21 | mpd 15 | . . 3 ⊢ ((𝐶 ∈ 𝒫 (Vtx‘𝐺) ∧ (♯‘𝐶) = 2) → ∃𝑎∃𝑏((𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ∧ (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏}))) |
23 | 4, 22 | syl 17 | . 2 ⊢ ((𝐺 ∈ UMGraph ∧ 𝐶 ∈ 𝐸) → ∃𝑎∃𝑏((𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ∧ (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏}))) |
24 | r2ex 3303 | . 2 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏}) ↔ ∃𝑎∃𝑏((𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ∧ (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏}))) | |
25 | 23, 24 | sylibr 236 | 1 ⊢ ((𝐺 ∈ UMGraph ∧ 𝐶 ∈ 𝐸) → ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑎 ≠ 𝑏 ∧ 𝐶 = {𝑎, 𝑏})) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1533 ∃wex 1776 ∈ wcel 2110 ≠ wne 3016 ∃wrex 3139 ⊆ wss 3935 𝒫 cpw 4538 {cpr 4562 ‘cfv 6349 2c2 11686 ♯chash 13684 Vtxcvtx 26775 Edgcedg 26826 UMGraphcumgr 26860 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5182 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-pred 6142 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-om 7575 df-1st 7683 df-2nd 7684 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-2o 8097 df-oadd 8100 df-er 8283 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-dju 9324 df-card 9362 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-nn 11633 df-2 11694 df-n0 11892 df-z 11976 df-uz 12238 df-fz 12887 df-hash 13685 df-edg 26827 df-umgr 26862 |
This theorem is referenced by: usgredg 26975 umgr2cycllem 32382 |
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