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Mirrors > Home > MPE Home > Th. List > usgredgprvALT | Structured version Visualization version GIF version |
Description: Alternate proof of usgredgprv 26970, using usgredg2 26968 instead of umgredgprv 26886. (Contributed by Alexander van der Vekens, 19-Aug-2017.) (Revised by AV, 16-Oct-2020.) (New usage is discouraged.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
usgredg2.e | ⊢ 𝐸 = (iEdg‘𝐺) |
usgredgprv.v | ⊢ 𝑉 = (Vtx‘𝐺) |
Ref | Expression |
---|---|
usgredgprvALT | ⊢ ((𝐺 ∈ USGraph ∧ 𝑋 ∈ dom 𝐸) → ((𝐸‘𝑋) = {𝑀, 𝑁} → (𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | usgredg2.e | . . 3 ⊢ 𝐸 = (iEdg‘𝐺) | |
2 | usgredgprv.v | . . 3 ⊢ 𝑉 = (Vtx‘𝐺) | |
3 | 1, 2 | usgrss 26953 | . 2 ⊢ ((𝐺 ∈ USGraph ∧ 𝑋 ∈ dom 𝐸) → (𝐸‘𝑋) ⊆ 𝑉) |
4 | 1 | usgredg2 26968 | . 2 ⊢ ((𝐺 ∈ USGraph ∧ 𝑋 ∈ dom 𝐸) → (♯‘(𝐸‘𝑋)) = 2) |
5 | sseq1 3991 | . . . . 5 ⊢ ((𝐸‘𝑋) = {𝑀, 𝑁} → ((𝐸‘𝑋) ⊆ 𝑉 ↔ {𝑀, 𝑁} ⊆ 𝑉)) | |
6 | fveq2 6664 | . . . . . 6 ⊢ ((𝐸‘𝑋) = {𝑀, 𝑁} → (♯‘(𝐸‘𝑋)) = (♯‘{𝑀, 𝑁})) | |
7 | 6 | eqeq1d 2823 | . . . . 5 ⊢ ((𝐸‘𝑋) = {𝑀, 𝑁} → ((♯‘(𝐸‘𝑋)) = 2 ↔ (♯‘{𝑀, 𝑁}) = 2)) |
8 | 5, 7 | anbi12d 632 | . . . 4 ⊢ ((𝐸‘𝑋) = {𝑀, 𝑁} → (((𝐸‘𝑋) ⊆ 𝑉 ∧ (♯‘(𝐸‘𝑋)) = 2) ↔ ({𝑀, 𝑁} ⊆ 𝑉 ∧ (♯‘{𝑀, 𝑁}) = 2))) |
9 | eqid 2821 | . . . . . . 7 ⊢ {𝑀, 𝑁} = {𝑀, 𝑁} | |
10 | 9 | hashprdifel 13753 | . . . . . 6 ⊢ ((♯‘{𝑀, 𝑁}) = 2 → (𝑀 ∈ {𝑀, 𝑁} ∧ 𝑁 ∈ {𝑀, 𝑁} ∧ 𝑀 ≠ 𝑁)) |
11 | prssg 4745 | . . . . . . . 8 ⊢ ((𝑀 ∈ {𝑀, 𝑁} ∧ 𝑁 ∈ {𝑀, 𝑁}) → ((𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉) ↔ {𝑀, 𝑁} ⊆ 𝑉)) | |
12 | 11 | 3adant3 1128 | . . . . . . 7 ⊢ ((𝑀 ∈ {𝑀, 𝑁} ∧ 𝑁 ∈ {𝑀, 𝑁} ∧ 𝑀 ≠ 𝑁) → ((𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉) ↔ {𝑀, 𝑁} ⊆ 𝑉)) |
13 | 12 | biimprd 250 | . . . . . 6 ⊢ ((𝑀 ∈ {𝑀, 𝑁} ∧ 𝑁 ∈ {𝑀, 𝑁} ∧ 𝑀 ≠ 𝑁) → ({𝑀, 𝑁} ⊆ 𝑉 → (𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉))) |
14 | 10, 13 | syl 17 | . . . . 5 ⊢ ((♯‘{𝑀, 𝑁}) = 2 → ({𝑀, 𝑁} ⊆ 𝑉 → (𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉))) |
15 | 14 | impcom 410 | . . . 4 ⊢ (({𝑀, 𝑁} ⊆ 𝑉 ∧ (♯‘{𝑀, 𝑁}) = 2) → (𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉)) |
16 | 8, 15 | syl6bi 255 | . . 3 ⊢ ((𝐸‘𝑋) = {𝑀, 𝑁} → (((𝐸‘𝑋) ⊆ 𝑉 ∧ (♯‘(𝐸‘𝑋)) = 2) → (𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉))) |
17 | 16 | com12 32 | . 2 ⊢ (((𝐸‘𝑋) ⊆ 𝑉 ∧ (♯‘(𝐸‘𝑋)) = 2) → ((𝐸‘𝑋) = {𝑀, 𝑁} → (𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉))) |
18 | 3, 4, 17 | syl2anc 586 | 1 ⊢ ((𝐺 ∈ USGraph ∧ 𝑋 ∈ dom 𝐸) → ((𝐸‘𝑋) = {𝑀, 𝑁} → (𝑀 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 ≠ wne 3016 ⊆ wss 3935 {cpr 4562 dom cdm 5549 ‘cfv 6349 2c2 11686 ♯chash 13684 Vtxcvtx 26775 iEdgciedg 26776 USGraphcusgr 26928 |
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-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-umgr 26862 df-usgr 26930 |
This theorem is referenced by: (None) |
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