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Mirrors > Home > MPE Home > Th. List > 1egrvtxdg1r | Structured version Visualization version GIF version |
Description: The vertex degree of a one-edge graph, case 3: an edge from some other vertex to the given vertex contributes one to the vertex's degree. (Contributed by Mario Carneiro, 12-Mar-2015.) (Revised by Alexander van der Vekens, 22-Dec-2017.) (Revised by AV, 21-Feb-2021.) |
Ref | Expression |
---|---|
1egrvtxdg1.v | β’ (π β (VtxβπΊ) = π) |
1egrvtxdg1.a | β’ (π β π΄ β π) |
1egrvtxdg1.b | β’ (π β π΅ β π) |
1egrvtxdg1.c | β’ (π β πΆ β π) |
1egrvtxdg1.n | β’ (π β π΅ β πΆ) |
1egrvtxdg1.i | β’ (π β (iEdgβπΊ) = {β¨π΄, {π΅, πΆ}β©}) |
Ref | Expression |
---|---|
1egrvtxdg1r | β’ (π β ((VtxDegβπΊ)βπΆ) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1egrvtxdg1.v | . 2 β’ (π β (VtxβπΊ) = π) | |
2 | 1egrvtxdg1.a | . 2 β’ (π β π΄ β π) | |
3 | 1egrvtxdg1.c | . 2 β’ (π β πΆ β π) | |
4 | 1egrvtxdg1.b | . 2 β’ (π β π΅ β π) | |
5 | 1egrvtxdg1.n | . . 3 β’ (π β π΅ β πΆ) | |
6 | 5 | necomd 2991 | . 2 β’ (π β πΆ β π΅) |
7 | 1egrvtxdg1.i | . . 3 β’ (π β (iEdgβπΊ) = {β¨π΄, {π΅, πΆ}β©}) | |
8 | prcom 4732 | . . . . . 6 β’ {π΅, πΆ} = {πΆ, π΅} | |
9 | 8 | a1i 11 | . . . . 5 β’ (π β {π΅, πΆ} = {πΆ, π΅}) |
10 | 9 | opeq2d 4876 | . . . 4 β’ (π β β¨π΄, {π΅, πΆ}β© = β¨π΄, {πΆ, π΅}β©) |
11 | 10 | sneqd 4636 | . . 3 β’ (π β {β¨π΄, {π΅, πΆ}β©} = {β¨π΄, {πΆ, π΅}β©}) |
12 | 7, 11 | eqtrd 2767 | . 2 β’ (π β (iEdgβπΊ) = {β¨π΄, {πΆ, π΅}β©}) |
13 | 1, 2, 3, 4, 6, 12 | 1egrvtxdg1 29297 | 1 β’ (π β ((VtxDegβπΊ)βπΆ) = 1) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 = wceq 1534 β wcel 2099 β wne 2935 {csn 4624 {cpr 4626 β¨cop 4630 βcfv 6542 1c1 11125 Vtxcvtx 28783 iEdgciedg 28784 VtxDegcvtxdg 29253 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7732 ax-cnex 11180 ax-resscn 11181 ax-1cn 11182 ax-icn 11183 ax-addcl 11184 ax-addrcl 11185 ax-mulcl 11186 ax-mulrcl 11187 ax-mulcom 11188 ax-addass 11189 ax-mulass 11190 ax-distr 11191 ax-i2m1 11192 ax-1ne0 11193 ax-1rid 11194 ax-rnegex 11195 ax-rrecex 11196 ax-cnre 11197 ax-pre-lttri 11198 ax-pre-lttrn 11199 ax-pre-ltadd 11200 ax-pre-mulgt0 11201 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7863 df-1st 7985 df-2nd 7986 df-frecs 8278 df-wrecs 8309 df-recs 8383 df-rdg 8422 df-1o 8478 df-oadd 8482 df-er 8716 df-en 8954 df-dom 8955 df-sdom 8956 df-fin 8957 df-dju 9910 df-card 9948 df-pnf 11266 df-mnf 11267 df-xr 11268 df-ltxr 11269 df-le 11270 df-sub 11462 df-neg 11463 df-nn 12229 df-2 12291 df-n0 12489 df-xnn0 12561 df-z 12575 df-uz 12839 df-xadd 13111 df-fz 13503 df-hash 14308 df-edg 28835 df-upgr 28869 df-umgr 28870 df-uspgr 28937 df-usgr 28938 df-vtxdg 29254 |
This theorem is referenced by: (None) |
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