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Mirrors > Home > MPE Home > Th. List > cusgrsizeinds | Structured version Visualization version GIF version |
Description: Part 1 of induction step in cusgrsize 27821. The size of a complete simple graph with 𝑛 vertices is (𝑛 − 1) plus the size of the complete graph reduced by one vertex. (Contributed by Alexander van der Vekens, 11-Jan-2018.) (Revised by AV, 9-Nov-2020.) |
Ref | Expression |
---|---|
cusgrsizeindb0.v | ⊢ 𝑉 = (Vtx‘𝐺) |
cusgrsizeindb0.e | ⊢ 𝐸 = (Edg‘𝐺) |
cusgrsizeinds.f | ⊢ 𝐹 = {𝑒 ∈ 𝐸 ∣ 𝑁 ∉ 𝑒} |
Ref | Expression |
---|---|
cusgrsizeinds | ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) → (♯‘𝐸) = (((♯‘𝑉) − 1) + (♯‘𝐹))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cusgrusgr 27786 | . . . 4 ⊢ (𝐺 ∈ ComplUSGraph → 𝐺 ∈ USGraph) | |
2 | cusgrsizeindb0.v | . . . . . . . 8 ⊢ 𝑉 = (Vtx‘𝐺) | |
3 | 2 | isfusgr 27685 | . . . . . . 7 ⊢ (𝐺 ∈ FinUSGraph ↔ (𝐺 ∈ USGraph ∧ 𝑉 ∈ Fin)) |
4 | fusgrfis 27697 | . . . . . . 7 ⊢ (𝐺 ∈ FinUSGraph → (Edg‘𝐺) ∈ Fin) | |
5 | 3, 4 | sylbir 234 | . . . . . 6 ⊢ ((𝐺 ∈ USGraph ∧ 𝑉 ∈ Fin) → (Edg‘𝐺) ∈ Fin) |
6 | 5 | a1d 25 | . . . . 5 ⊢ ((𝐺 ∈ USGraph ∧ 𝑉 ∈ Fin) → (𝑁 ∈ 𝑉 → (Edg‘𝐺) ∈ Fin)) |
7 | 6 | ex 413 | . . . 4 ⊢ (𝐺 ∈ USGraph → (𝑉 ∈ Fin → (𝑁 ∈ 𝑉 → (Edg‘𝐺) ∈ Fin))) |
8 | 1, 7 | syl 17 | . . 3 ⊢ (𝐺 ∈ ComplUSGraph → (𝑉 ∈ Fin → (𝑁 ∈ 𝑉 → (Edg‘𝐺) ∈ Fin))) |
9 | 8 | 3imp 1110 | . 2 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) → (Edg‘𝐺) ∈ Fin) |
10 | eqid 2738 | . . . . . . 7 ⊢ {𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} = {𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} | |
11 | cusgrsizeinds.f | . . . . . . 7 ⊢ 𝐹 = {𝑒 ∈ 𝐸 ∣ 𝑁 ∉ 𝑒} | |
12 | 10, 11 | elnelun 4323 | . . . . . 6 ⊢ ({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∪ 𝐹) = 𝐸 |
13 | 12 | eqcomi 2747 | . . . . 5 ⊢ 𝐸 = ({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∪ 𝐹) |
14 | 13 | fveq2i 6777 | . . . 4 ⊢ (♯‘𝐸) = (♯‘({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∪ 𝐹)) |
15 | 14 | a1i 11 | . . 3 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) ∧ (Edg‘𝐺) ∈ Fin) → (♯‘𝐸) = (♯‘({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∪ 𝐹))) |
16 | cusgrsizeindb0.e | . . . . . . . 8 ⊢ 𝐸 = (Edg‘𝐺) | |
17 | 16 | eqcomi 2747 | . . . . . . 7 ⊢ (Edg‘𝐺) = 𝐸 |
18 | 17 | eleq1i 2829 | . . . . . 6 ⊢ ((Edg‘𝐺) ∈ Fin ↔ 𝐸 ∈ Fin) |
19 | rabfi 9044 | . . . . . 6 ⊢ (𝐸 ∈ Fin → {𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∈ Fin) | |
20 | 18, 19 | sylbi 216 | . . . . 5 ⊢ ((Edg‘𝐺) ∈ Fin → {𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∈ Fin) |
21 | 20 | adantl 482 | . . . 4 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) ∧ (Edg‘𝐺) ∈ Fin) → {𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∈ Fin) |
22 | 1 | anim1i 615 | . . . . . . . 8 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin) → (𝐺 ∈ USGraph ∧ 𝑉 ∈ Fin)) |
23 | 22, 3 | sylibr 233 | . . . . . . 7 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin) → 𝐺 ∈ FinUSGraph) |
24 | 2, 16, 11 | usgrfilem 27694 | . . . . . . 7 ⊢ ((𝐺 ∈ FinUSGraph ∧ 𝑁 ∈ 𝑉) → (𝐸 ∈ Fin ↔ 𝐹 ∈ Fin)) |
25 | 23, 24 | stoic3 1779 | . . . . . 6 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) → (𝐸 ∈ Fin ↔ 𝐹 ∈ Fin)) |
26 | 18, 25 | bitrid 282 | . . . . 5 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) → ((Edg‘𝐺) ∈ Fin ↔ 𝐹 ∈ Fin)) |
27 | 26 | biimpa 477 | . . . 4 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) ∧ (Edg‘𝐺) ∈ Fin) → 𝐹 ∈ Fin) |
28 | 10, 11 | elneldisj 4322 | . . . . 5 ⊢ ({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∩ 𝐹) = ∅ |
29 | 28 | a1i 11 | . . . 4 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) ∧ (Edg‘𝐺) ∈ Fin) → ({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∩ 𝐹) = ∅) |
30 | hashun 14097 | . . . 4 ⊢ (({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∈ Fin ∧ 𝐹 ∈ Fin ∧ ({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∩ 𝐹) = ∅) → (♯‘({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∪ 𝐹)) = ((♯‘{𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒}) + (♯‘𝐹))) | |
31 | 21, 27, 29, 30 | syl3anc 1370 | . . 3 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) ∧ (Edg‘𝐺) ∈ Fin) → (♯‘({𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒} ∪ 𝐹)) = ((♯‘{𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒}) + (♯‘𝐹))) |
32 | 2, 16 | cusgrsizeindslem 27818 | . . . . 5 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) → (♯‘{𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒}) = ((♯‘𝑉) − 1)) |
33 | 32 | adantr 481 | . . . 4 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) ∧ (Edg‘𝐺) ∈ Fin) → (♯‘{𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒}) = ((♯‘𝑉) − 1)) |
34 | 33 | oveq1d 7290 | . . 3 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) ∧ (Edg‘𝐺) ∈ Fin) → ((♯‘{𝑒 ∈ 𝐸 ∣ 𝑁 ∈ 𝑒}) + (♯‘𝐹)) = (((♯‘𝑉) − 1) + (♯‘𝐹))) |
35 | 15, 31, 34 | 3eqtrd 2782 | . 2 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) ∧ (Edg‘𝐺) ∈ Fin) → (♯‘𝐸) = (((♯‘𝑉) − 1) + (♯‘𝐹))) |
36 | 9, 35 | mpdan 684 | 1 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑉 ∈ Fin ∧ 𝑁 ∈ 𝑉) → (♯‘𝐸) = (((♯‘𝑉) − 1) + (♯‘𝐹))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ∉ wnel 3049 {crab 3068 ∪ cun 3885 ∩ cin 3886 ∅c0 4256 ‘cfv 6433 (class class class)co 7275 Fincfn 8733 1c1 10872 + caddc 10874 − cmin 11205 ♯chash 14044 Vtxcvtx 27366 Edgcedg 27417 USGraphcusgr 27519 FinUSGraphcfusgr 27683 ComplUSGraphccusgr 27777 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-2o 8298 df-oadd 8301 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-dju 9659 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-nn 11974 df-2 12036 df-n0 12234 df-xnn0 12306 df-z 12320 df-uz 12583 df-fz 13240 df-hash 14045 df-vtx 27368 df-iedg 27369 df-edg 27418 df-uhgr 27428 df-upgr 27452 df-umgr 27453 df-uspgr 27520 df-usgr 27521 df-fusgr 27684 df-nbgr 27700 df-uvtx 27753 df-cplgr 27778 df-cusgr 27779 |
This theorem is referenced by: cusgrsize2inds 27820 |
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