Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > 1loopgrvd0 | Structured version Visualization version GIF version |
Description: The vertex degree of a one-edge graph, case 1 (for a loop): a loop at a vertex other than the given vertex contributes nothing to the vertex degree. (Contributed by Mario Carneiro, 12-Mar-2015.) (Revised by AV, 21-Feb-2021.) |
Ref | Expression |
---|---|
1loopgruspgr.v | ⊢ (𝜑 → (Vtx‘𝐺) = 𝑉) |
1loopgruspgr.a | ⊢ (𝜑 → 𝐴 ∈ 𝑋) |
1loopgruspgr.n | ⊢ (𝜑 → 𝑁 ∈ 𝑉) |
1loopgruspgr.i | ⊢ (𝜑 → (iEdg‘𝐺) = {〈𝐴, {𝑁}〉}) |
1loopgrvd0.k | ⊢ (𝜑 → 𝐾 ∈ (𝑉 ∖ {𝑁})) |
Ref | Expression |
---|---|
1loopgrvd0 | ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝐾) = 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1loopgrvd0.k | . . . . 5 ⊢ (𝜑 → 𝐾 ∈ (𝑉 ∖ {𝑁})) | |
2 | 1 | eldifbd 3951 | . . . 4 ⊢ (𝜑 → ¬ 𝐾 ∈ {𝑁}) |
3 | 1loopgruspgr.a | . . . . . 6 ⊢ (𝜑 → 𝐴 ∈ 𝑋) | |
4 | snex 5334 | . . . . . 6 ⊢ {𝑁} ∈ V | |
5 | fvsng 6944 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑋 ∧ {𝑁} ∈ V) → ({〈𝐴, {𝑁}〉}‘𝐴) = {𝑁}) | |
6 | 3, 4, 5 | sylancl 588 | . . . . 5 ⊢ (𝜑 → ({〈𝐴, {𝑁}〉}‘𝐴) = {𝑁}) |
7 | 6 | eleq2d 2900 | . . . 4 ⊢ (𝜑 → (𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝐴) ↔ 𝐾 ∈ {𝑁})) |
8 | 2, 7 | mtbird 327 | . . 3 ⊢ (𝜑 → ¬ 𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝐴)) |
9 | 1loopgruspgr.i | . . . . . . 7 ⊢ (𝜑 → (iEdg‘𝐺) = {〈𝐴, {𝑁}〉}) | |
10 | 9 | dmeqd 5776 | . . . . . 6 ⊢ (𝜑 → dom (iEdg‘𝐺) = dom {〈𝐴, {𝑁}〉}) |
11 | dmsnopg 6072 | . . . . . . 7 ⊢ ({𝑁} ∈ V → dom {〈𝐴, {𝑁}〉} = {𝐴}) | |
12 | 4, 11 | mp1i 13 | . . . . . 6 ⊢ (𝜑 → dom {〈𝐴, {𝑁}〉} = {𝐴}) |
13 | 10, 12 | eqtrd 2858 | . . . . 5 ⊢ (𝜑 → dom (iEdg‘𝐺) = {𝐴}) |
14 | 9 | fveq1d 6674 | . . . . . 6 ⊢ (𝜑 → ((iEdg‘𝐺)‘𝑖) = ({〈𝐴, {𝑁}〉}‘𝑖)) |
15 | 14 | eleq2d 2900 | . . . . 5 ⊢ (𝜑 → (𝐾 ∈ ((iEdg‘𝐺)‘𝑖) ↔ 𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝑖))) |
16 | 13, 15 | rexeqbidv 3404 | . . . 4 ⊢ (𝜑 → (∃𝑖 ∈ dom (iEdg‘𝐺)𝐾 ∈ ((iEdg‘𝐺)‘𝑖) ↔ ∃𝑖 ∈ {𝐴}𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝑖))) |
17 | fveq2 6672 | . . . . . . 7 ⊢ (𝑖 = 𝐴 → ({〈𝐴, {𝑁}〉}‘𝑖) = ({〈𝐴, {𝑁}〉}‘𝐴)) | |
18 | 17 | eleq2d 2900 | . . . . . 6 ⊢ (𝑖 = 𝐴 → (𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝑖) ↔ 𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝐴))) |
19 | 18 | rexsng 4616 | . . . . 5 ⊢ (𝐴 ∈ 𝑋 → (∃𝑖 ∈ {𝐴}𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝑖) ↔ 𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝐴))) |
20 | 3, 19 | syl 17 | . . . 4 ⊢ (𝜑 → (∃𝑖 ∈ {𝐴}𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝑖) ↔ 𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝐴))) |
21 | 16, 20 | bitrd 281 | . . 3 ⊢ (𝜑 → (∃𝑖 ∈ dom (iEdg‘𝐺)𝐾 ∈ ((iEdg‘𝐺)‘𝑖) ↔ 𝐾 ∈ ({〈𝐴, {𝑁}〉}‘𝐴))) |
22 | 8, 21 | mtbird 327 | . 2 ⊢ (𝜑 → ¬ ∃𝑖 ∈ dom (iEdg‘𝐺)𝐾 ∈ ((iEdg‘𝐺)‘𝑖)) |
23 | 1 | eldifad 3950 | . . . 4 ⊢ (𝜑 → 𝐾 ∈ 𝑉) |
24 | 1loopgruspgr.v | . . . . 5 ⊢ (𝜑 → (Vtx‘𝐺) = 𝑉) | |
25 | 24 | eleq2d 2900 | . . . 4 ⊢ (𝜑 → (𝐾 ∈ (Vtx‘𝐺) ↔ 𝐾 ∈ 𝑉)) |
26 | 23, 25 | mpbird 259 | . . 3 ⊢ (𝜑 → 𝐾 ∈ (Vtx‘𝐺)) |
27 | eqid 2823 | . . . 4 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺) | |
28 | eqid 2823 | . . . 4 ⊢ (iEdg‘𝐺) = (iEdg‘𝐺) | |
29 | eqid 2823 | . . . 4 ⊢ (VtxDeg‘𝐺) = (VtxDeg‘𝐺) | |
30 | 27, 28, 29 | vtxd0nedgb 27272 | . . 3 ⊢ (𝐾 ∈ (Vtx‘𝐺) → (((VtxDeg‘𝐺)‘𝐾) = 0 ↔ ¬ ∃𝑖 ∈ dom (iEdg‘𝐺)𝐾 ∈ ((iEdg‘𝐺)‘𝑖))) |
31 | 26, 30 | syl 17 | . 2 ⊢ (𝜑 → (((VtxDeg‘𝐺)‘𝐾) = 0 ↔ ¬ ∃𝑖 ∈ dom (iEdg‘𝐺)𝐾 ∈ ((iEdg‘𝐺)‘𝑖))) |
32 | 22, 31 | mpbird 259 | 1 ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝐾) = 0) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 = wceq 1537 ∈ wcel 2114 ∃wrex 3141 Vcvv 3496 ∖ cdif 3935 {csn 4569 〈cop 4575 dom cdm 5557 ‘cfv 6357 0cc0 10539 Vtxcvtx 26783 iEdgciedg 26784 VtxDegcvtxdg 27249 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-rep 5192 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-1st 7691 df-2nd 7692 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-1o 8104 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-fin 8515 df-card 9370 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-nn 11641 df-n0 11901 df-xnn0 11971 df-z 11985 df-uz 12247 df-xadd 12511 df-fz 12896 df-hash 13694 df-vtxdg 27250 |
This theorem is referenced by: 1egrvtxdg0 27295 eupth2lem3lem3 28011 |
Copyright terms: Public domain | W3C validator |