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Mirrors > Home > MPE Home > Th. List > Mathboxes > vdegp1bi-av | Structured version Visualization version GIF version |
Description: The induction step for a vertex degree calculation. If the degree of 𝑈 in the edge set 𝐸 is 𝑃, then adding {𝑈, 𝑋} to the edge set, where 𝑋 ≠ 𝑈, yields degree 𝑃 + 1. (Contributed by Mario Carneiro, 12-Mar-2015.) (Revised by Mario Carneiro, 28-Feb-2016.) (Revised by AV, 3-Mar-2021.) |
Ref | Expression |
---|---|
vdegp1ai-av.vg | ⊢ 𝑉 = (Vtx‘𝐺) |
vdegp1ai-av.u | ⊢ 𝑈 ∈ 𝑉 |
vdegp1ai-av.i | ⊢ 𝐼 = (iEdg‘𝐺) |
vdegp1ai-av.w | ⊢ 𝐼 ∈ Word {𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (#‘𝑥) ≤ 2} |
vdegp1ai-av.d | ⊢ ((VtxDeg‘𝐺)‘𝑈) = 𝑃 |
vdegp1ai-av.vf | ⊢ (Vtx‘𝐹) = 𝑉 |
vdegp1bi-av.x | ⊢ 𝑋 ∈ 𝑉 |
vdegp1bi-av.xu | ⊢ 𝑋 ≠ 𝑈 |
vdegp1bi-av.f | ⊢ (iEdg‘𝐹) = (𝐼 ++ 〈“{𝑈, 𝑋}”〉) |
Ref | Expression |
---|---|
vdegp1bi-av | ⊢ ((VtxDeg‘𝐹)‘𝑈) = (𝑃 + 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | prex 4836 | . . 3 ⊢ {𝑈, 𝑋} ∈ V | |
2 | vdegp1ai-av.vg | . . . 4 ⊢ 𝑉 = (Vtx‘𝐺) | |
3 | vdegp1ai-av.i | . . . 4 ⊢ 𝐼 = (iEdg‘𝐺) | |
4 | vdegp1ai-av.w | . . . . 5 ⊢ 𝐼 ∈ Word {𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (#‘𝑥) ≤ 2} | |
5 | wrdf 13165 | . . . . . 6 ⊢ (𝐼 ∈ Word {𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (#‘𝑥) ≤ 2} → 𝐼:(0..^(#‘𝐼))⟶{𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (#‘𝑥) ≤ 2}) | |
6 | 5 | ffund 5962 | . . . . 5 ⊢ (𝐼 ∈ Word {𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (#‘𝑥) ≤ 2} → Fun 𝐼) |
7 | 4, 6 | mp1i 13 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → Fun 𝐼) |
8 | vdegp1ai-av.vf | . . . . 5 ⊢ (Vtx‘𝐹) = 𝑉 | |
9 | 8 | a1i 11 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → (Vtx‘𝐹) = 𝑉) |
10 | vdegp1bi-av.f | . . . . 5 ⊢ (iEdg‘𝐹) = (𝐼 ++ 〈“{𝑈, 𝑋}”〉) | |
11 | wrdv 13175 | . . . . . . 7 ⊢ (𝐼 ∈ Word {𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (#‘𝑥) ≤ 2} → 𝐼 ∈ Word V) | |
12 | 4, 11 | ax-mp 5 | . . . . . 6 ⊢ 𝐼 ∈ Word V |
13 | cats1un 13327 | . . . . . 6 ⊢ ((𝐼 ∈ Word V ∧ {𝑈, 𝑋} ∈ V) → (𝐼 ++ 〈“{𝑈, 𝑋}”〉) = (𝐼 ∪ {〈(#‘𝐼), {𝑈, 𝑋}〉})) | |
14 | 12, 13 | mpan 702 | . . . . 5 ⊢ ({𝑈, 𝑋} ∈ V → (𝐼 ++ 〈“{𝑈, 𝑋}”〉) = (𝐼 ∪ {〈(#‘𝐼), {𝑈, 𝑋}〉})) |
15 | 10, 14 | syl5eq 2656 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → (iEdg‘𝐹) = (𝐼 ∪ {〈(#‘𝐼), {𝑈, 𝑋}〉})) |
16 | fvex 6113 | . . . . 5 ⊢ (#‘𝐼) ∈ V | |
17 | 16 | a1i 11 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → (#‘𝐼) ∈ V) |
18 | wrdlndm 13176 | . . . . 5 ⊢ (𝐼 ∈ Word {𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (#‘𝑥) ≤ 2} → (#‘𝐼) ∉ dom 𝐼) | |
19 | 4, 18 | mp1i 13 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → (#‘𝐼) ∉ dom 𝐼) |
20 | vdegp1ai-av.u | . . . . 5 ⊢ 𝑈 ∈ 𝑉 | |
21 | 20 | a1i 11 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → 𝑈 ∈ 𝑉) |
22 | vdegp1bi-av.x | . . . . . 6 ⊢ 𝑋 ∈ 𝑉 | |
23 | 20, 22 | pm3.2i 470 | . . . . 5 ⊢ (𝑈 ∈ 𝑉 ∧ 𝑋 ∈ 𝑉) |
24 | prelpwi 4842 | . . . . 5 ⊢ ((𝑈 ∈ 𝑉 ∧ 𝑋 ∈ 𝑉) → {𝑈, 𝑋} ∈ 𝒫 𝑉) | |
25 | 23, 24 | mp1i 13 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → {𝑈, 𝑋} ∈ 𝒫 𝑉) |
26 | prid1g 4239 | . . . . 5 ⊢ (𝑈 ∈ 𝑉 → 𝑈 ∈ {𝑈, 𝑋}) | |
27 | 20, 26 | mp1i 13 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → 𝑈 ∈ {𝑈, 𝑋}) |
28 | vdegp1bi-av.xu | . . . . . . . 8 ⊢ 𝑋 ≠ 𝑈 | |
29 | 28 | necomi 2836 | . . . . . . 7 ⊢ 𝑈 ≠ 𝑋 |
30 | hashprg 13043 | . . . . . . . 8 ⊢ ((𝑈 ∈ 𝑉 ∧ 𝑋 ∈ 𝑉) → (𝑈 ≠ 𝑋 ↔ (#‘{𝑈, 𝑋}) = 2)) | |
31 | 20, 22, 30 | mp2an 704 | . . . . . . 7 ⊢ (𝑈 ≠ 𝑋 ↔ (#‘{𝑈, 𝑋}) = 2) |
32 | 29, 31 | mpbi 219 | . . . . . 6 ⊢ (#‘{𝑈, 𝑋}) = 2 |
33 | 32 | eqcomi 2619 | . . . . 5 ⊢ 2 = (#‘{𝑈, 𝑋}) |
34 | 2re 10967 | . . . . . 6 ⊢ 2 ∈ ℝ | |
35 | 34 | eqlei 10026 | . . . . 5 ⊢ (2 = (#‘{𝑈, 𝑋}) → 2 ≤ (#‘{𝑈, 𝑋})) |
36 | 33, 35 | mp1i 13 | . . . 4 ⊢ ({𝑈, 𝑋} ∈ V → 2 ≤ (#‘{𝑈, 𝑋})) |
37 | 2, 3, 7, 9, 15, 17, 19, 21, 25, 27, 36 | p1evtxdp1 40730 | . . 3 ⊢ ({𝑈, 𝑋} ∈ V → ((VtxDeg‘𝐹)‘𝑈) = (((VtxDeg‘𝐺)‘𝑈) +𝑒 1)) |
38 | 1, 37 | ax-mp 5 | . 2 ⊢ ((VtxDeg‘𝐹)‘𝑈) = (((VtxDeg‘𝐺)‘𝑈) +𝑒 1) |
39 | fzofi 12635 | . . . . 5 ⊢ (0..^(#‘𝐼)) ∈ Fin | |
40 | wrddm 13167 | . . . . . . . 8 ⊢ (𝐼 ∈ Word {𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (#‘𝑥) ≤ 2} → dom 𝐼 = (0..^(#‘𝐼))) | |
41 | 4, 40 | ax-mp 5 | . . . . . . 7 ⊢ dom 𝐼 = (0..^(#‘𝐼)) |
42 | 41 | eqcomi 2619 | . . . . . 6 ⊢ (0..^(#‘𝐼)) = dom 𝐼 |
43 | 2, 3, 42 | vtxdgfisnn0 40690 | . . . . 5 ⊢ (((0..^(#‘𝐼)) ∈ Fin ∧ 𝑈 ∈ 𝑉) → ((VtxDeg‘𝐺)‘𝑈) ∈ ℕ0) |
44 | 39, 20, 43 | mp2an 704 | . . . 4 ⊢ ((VtxDeg‘𝐺)‘𝑈) ∈ ℕ0 |
45 | 44 | nn0rei 11180 | . . 3 ⊢ ((VtxDeg‘𝐺)‘𝑈) ∈ ℝ |
46 | 1re 9918 | . . 3 ⊢ 1 ∈ ℝ | |
47 | rexadd 11937 | . . 3 ⊢ ((((VtxDeg‘𝐺)‘𝑈) ∈ ℝ ∧ 1 ∈ ℝ) → (((VtxDeg‘𝐺)‘𝑈) +𝑒 1) = (((VtxDeg‘𝐺)‘𝑈) + 1)) | |
48 | 45, 46, 47 | mp2an 704 | . 2 ⊢ (((VtxDeg‘𝐺)‘𝑈) +𝑒 1) = (((VtxDeg‘𝐺)‘𝑈) + 1) |
49 | vdegp1ai-av.d | . . 3 ⊢ ((VtxDeg‘𝐺)‘𝑈) = 𝑃 | |
50 | 49 | oveq1i 6559 | . 2 ⊢ (((VtxDeg‘𝐺)‘𝑈) + 1) = (𝑃 + 1) |
51 | 38, 48, 50 | 3eqtri 2636 | 1 ⊢ ((VtxDeg‘𝐹)‘𝑈) = (𝑃 + 1) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 195 ∧ wa 383 = wceq 1475 ∈ wcel 1977 ≠ wne 2780 ∉ wnel 2781 {crab 2900 Vcvv 3173 ∖ cdif 3537 ∪ cun 3538 ∅c0 3874 𝒫 cpw 4108 {csn 4125 {cpr 4127 〈cop 4131 class class class wbr 4583 dom cdm 5038 Fun wfun 5798 ‘cfv 5804 (class class class)co 6549 Fincfn 7841 ℝcr 9814 0cc0 9815 1c1 9816 + caddc 9818 ≤ cle 9954 2c2 10947 ℕ0cn0 11169 +𝑒 cxad 11820 ..^cfzo 12334 #chash 12979 Word cword 13146 ++ cconcat 13148 〈“cs1 13149 Vtxcvtx 25673 iEdgciedg 25674 VtxDegcvtxdg 40681 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-1o 7447 df-oadd 7451 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-fin 7845 df-card 8648 df-cda 8873 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-nn 10898 df-2 10956 df-n0 11170 df-xnn0 11241 df-z 11255 df-uz 11564 df-xadd 11823 df-fz 12198 df-fzo 12335 df-hash 12980 df-word 13154 df-concat 13156 df-s1 13157 df-vtx 25675 df-iedg 25676 df-vtxdg 40682 |
This theorem is referenced by: vdegp1ci-av 40754 konigsberglem1 41422 konigsberglem2 41423 |
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