Theorem vtxduspgrfvedgfi 16296

Description: The value of the vertex degree function for a simple pseudograph. (Contributed by AV, 12-Dec-2020.) (Proof shortened by AV, 5-May-2021.)

Hypotheses

Ref	Expression
vtxdushgrfvedg.v	|- V = (Vtx ` G )
vtxdushgrfvedg.e	|- E = (Edg ` G )
vtxduspgrfvedgfi.fi	|- ( ph -> dom (iEdg ` G ) e. Fin )
vtxduspgrfvedgfi.v	|- ( ph -> V e. Fin )
vtxduspgrfvedgfi.u	|- ( ph -> U e. V )
vtxduspgrfvedgfi.g	|- ( ph -> G e. USPGraph )
vtxdushgrfvedg.d	|- D = (VtxDeg ` G )

Assertion

Ref	Expression
vtxduspgrfvedgfi	|- ( ph -> ( D ` U ) = ( (♯ ` { e e. E | U e. e } ) + (♯ ` { e e. E | e = { U } } ) ) )

Distinct variable groups:   e, E   e, G   U, e   e, V

Allowed substitution hints:   ph( e)   D( e)

Proof of Theorem vtxduspgrfvedgfi

Dummy variables c i x are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		vtxdushgrfvedg.d	. . . 4 |- D = (VtxDeg ` G )
2	1	fveq1i 5671	. . 3 |- ( D ` U ) = ( (VtxDeg ` G ) ` U )
3	2	a1i 9	. 2 |- ( ph -> ( D ` U ) = ( (VtxDeg ` G ) ` U ) )
4		vtxdushgrfvedg.v	. . 3 |- V = (Vtx ` G )
5		eqid 2232	. . 3 |- (iEdg ` G ) = (iEdg ` G )
6		eqid 2232	. . 3 |- dom (iEdg ` G ) = dom (iEdg ` G )
7		vtxduspgrfvedgfi.fi	. . 3 |- ( ph -> dom (iEdg ` G ) e. Fin )
8		vtxduspgrfvedgfi.v	. . 3 |- ( ph -> V e. Fin )
9		vtxduspgrfvedgfi.u	. . 3 |- ( ph -> U e. V )
10		vtxduspgrfvedgfi.g	. . . 4 |- ( ph -> G e. USPGraph )
11		uspgrupgr 16176	. . . 4 |- ( G e. USPGraph -> G e. UPGraph )
12	10, 11	syl 14	. . 3 |- ( ph -> G e. UPGraph )
13	4, 5, 6, 7, 8, 9, 12	vtxdgfifival 16286	. 2 |- ( ph -> ( (VtxDeg ` G ) ` U ) = ( (♯ ` { i e. dom (iEdg ` G ) | U e. ( (iEdg ` G ) ` i ) } ) + (♯ ` { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } ) ) )
14		vtxdushgrfvedg.e	. . . 4 |- E = (Edg ` G )
15	4, 14, 7, 8, 9, 10	vtxduspgrfvedgfilem 16295	. . 3 |- ( ph -> (♯ ` { i e. dom (iEdg ` G ) | U e. ( (iEdg ` G ) ` i ) } ) = (♯ ` { e e. E | U e. e } ) )
16	4, 5, 6, 7, 8, 9, 12	vtxlpfi 16285	. . . 4 |- ( ph -> { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } e. Fin )
17		uspgrushgr 16175	. . . . . 6 |- ( G e. USPGraph -> G e. USHGraph )
18	10, 17	syl 14	. . . . 5 |- ( ph -> G e. USHGraph )
19		eqid 2232	. . . . . 6 |- { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } = { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } }
20		eqeq1 2239	. . . . . . 7 |- ( e = c -> ( e = { U } <-> c = { U } ) )
21	20	cbvrabv 2812	. . . . . 6 |- { e e. E | e = { U } } = { c e. E | c = { U } }
22		eqid 2232	. . . . . 6 |- ( x e. { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } |-> ( (iEdg ` G ) ` x ) ) = ( x e. { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } |-> ( (iEdg ` G ) ` x ) )
23	14, 5, 19, 21, 22	ushgredgedgloop 16223	. . . . 5 |- ( ( G e. USHGraph /\ U e. V ) -> ( x e. { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } |-> ( (iEdg ` G ) ` x ) ) : { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } -1-1-onto-> { e e. E | e = { U } } )
24	18, 9, 23	syl2anc 411	. . . 4 |- ( ph -> ( x e. { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } |-> ( (iEdg ` G ) ` x ) ) : { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } -1-1-onto-> { e e. E | e = { U } } )
25	16, 24	fihasheqf1od 11152	. . 3 |- ( ph -> (♯ ` { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } ) = (♯ ` { e e. E | e = { U } } ) )
26	15, 25	oveq12d 6068	. 2 |- ( ph -> ( (♯ ` { i e. dom (iEdg ` G ) | U e. ( (iEdg ` G ) ` i ) } ) + (♯ ` { i e. dom (iEdg ` G ) | ( (iEdg ` G ) ` i ) = { U } } ) ) = ( (♯ ` { e e. E | U e. e } ) + (♯ ` { e e. E | e = { U } } ) ) )
27	3, 13, 26	3eqtrd 2269	1 |- ( ph -> ( D ` U ) = ( (♯ ` { e e. E | U e. e } ) + (♯ ` { e e. E | e = { U } } ) ) )

Syntax hints:   -> wi 4   = wceq 1398   e. wcel 2203   {crab 2524   {csn 3689   |-> cmpt 4171   dom cdm 4749   -1-1-onto->wf1o 5351   ` cfv 5352  (class class class)co 6050   Fincfn 6975   + caddc 8130  ♯chash 11138  Vtxcvtx 16007  iEdgciedg 16008  Edgcedg 16052  USHGraphcushgr 16063  UPGraphcupgr 16086  USPGraphcuspgr 16148  VtxDegcvtxdg 16281

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-coll 4225  ax-sep 4228  ax-nul 4236  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-iinf 4710  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-addcom 8227  ax-mulcom 8228  ax-addass 8229  ax-mulass 8230  ax-distr 8231  ax-i2m1 8232  ax-0lt1 8233  ax-1rid 8234  ax-0id 8235  ax-rnegex 8236  ax-cnre 8238  ax-pre-ltirr 8239  ax-pre-ltwlin 8240  ax-pre-lttrn 8241  ax-pre-ltadd 8243

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-if 3621  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-int 3950  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-tr 4209  df-id 4414  df-iord 4487  df-on 4489  df-ilim 4490  df-suc 4492  df-iom 4713  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-1st 6334  df-2nd 6335  df-recs 6536  df-frec 6622  df-1o 6647  df-2o 6648  df-er 6767  df-en 6976  df-dom 6977  df-fin 6978  df-pnf 8310  df-mnf 8311  df-xr 8312  df-ltxr 8313  df-le 8314  df-sub 8446  df-neg 8447  df-inn 9238  df-2 9296  df-3 9297  df-4 9298  df-5 9299  df-6 9300  df-7 9301  df-8 9302  df-9 9303  df-n0 9497  df-z 9578  df-dec 9710  df-uz 9854  df-xadd 10106  df-ihash 11139  df-ndx 13215  df-slot 13216  df-base 13218  df-edgf 16000  df-vtx 16009  df-iedg 16010  df-edg 16053  df-uhgrm 16064  df-ushgrm 16065  df-upgren 16088  df-uspgren 16150  df-vtxdg 16282

This theorem is referenced by:  1loopgrvd2fi  16300