Theorem p1evtxdeqfi 16536

Description: If an edge E which does not contain vertex U is added to a graph G (yielding a graph F), the degree of U is the same in both graphs. (Contributed by AV, 2-Mar-2021.)

Hypotheses

Ref	Expression
p1evtxdeq.v	|- V = (Vtx ` G )
p1evtxdeq.i	|- I = (iEdg ` G )
p1evtxdeq.f	|- ( ph -> Fun I )
p1evtxdeq.fv	|- ( ph -> (Vtx ` F ) = V )
p1evtxdeq.fi	|- ( ph -> (iEdg ` F ) = ( I u. { <. K , E >. } ) )
p1evtxdeq.k	|- ( ph -> K e. X )
p1evtxdeq.d	|- ( ph -> K e/ dom I )
p1evtxdeq.u	|- ( ph -> U e. V )
p1evtxdeqfi.vfi	|- ( ph -> V e. Fin )
p1evtxdeqfi.u	|- ( ph -> G e. UPGraph )
p1evtxdeqfi.ifi	|- ( ph -> dom I e. Fin )
p1evtxdeqfi.e	|- ( ph -> E e. ~P V )
p1evtxdeqfi.2o	|- ( ph -> E ~~ 2o )
p1evtxdeq.e	|- ( ph -> E e. Y )
p1evtxdeq.n	|- ( ph -> U e/ E )

Assertion

Ref	Expression
p1evtxdeqfi	|- ( ph -> ( (VtxDeg ` F ) ` U ) = ( (VtxDeg ` G ) ` U ) )

Proof of Theorem p1evtxdeqfi

Step	Hyp	Ref	Expression
1		p1evtxdeq.v	. . 3 |- V = (Vtx ` G )
2		p1evtxdeq.i	. . 3 |- I = (iEdg ` G )
3		p1evtxdeq.f	. . 3 |- ( ph -> Fun I )
4		p1evtxdeq.fv	. . 3 |- ( ph -> (Vtx ` F ) = V )
5		p1evtxdeq.fi	. . 3 |- ( ph -> (iEdg ` F ) = ( I u. { <. K , E >. } ) )
6		p1evtxdeq.k	. . 3 |- ( ph -> K e. X )
7		p1evtxdeq.d	. . 3 |- ( ph -> K e/ dom I )
8		p1evtxdeq.u	. . 3 |- ( ph -> U e. V )
9		p1evtxdeqfi.vfi	. . 3 |- ( ph -> V e. Fin )
10		p1evtxdeqfi.u	. . 3 |- ( ph -> G e. UPGraph )
11		p1evtxdeqfi.ifi	. . 3 |- ( ph -> dom I e. Fin )
12		p1evtxdeqfi.e	. . 3 |- ( ph -> E e. ~P V )
13		p1evtxdeqfi.2o	. . 3 |- ( ph -> E ~~ 2o )
14		p1evtxdeq.e	. . 3 |- ( ph -> E e. Y )
15	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14	p1evtxdeqfilem 16535	. 2 |- ( ph -> ( (VtxDeg ` F ) ` U ) = ( ( (VtxDeg ` G ) ` U ) + ( (VtxDeg ` <. V , { <. K , E >. } >. ) ` U ) ) )
16	9	elexd 2835	. . . . 5 |- ( ph -> V e. _V )
17		opexg 4366	. . . . . . 7 |- ( ( K e. X /\ E e. ~P V ) -> <. K , E >. e. _V )
18	6, 12, 17	syl2anc 415	. . . . . 6 |- ( ph -> <. K , E >. e. _V )
19		snexg 4319	. . . . . 6 |- ( <. K , E >. e. _V -> { <. K , E >. } e. _V )
20	18, 19	syl 14	. . . . 5 |- ( ph -> { <. K , E >. } e. _V )
21		opiedgfv 16249	. . . . 5 |- ( ( V e. _V /\ { <. K , E >. } e. _V ) -> (iEdg ` <. V , { <. K , E >. } >. ) = { <. K , E >. } )
22	16, 20, 21	syl2anc 415	. . . 4 |- ( ph -> (iEdg ` <. V , { <. K , E >. } >. ) = { <. K , E >. } )
23		opvtxfv 16246	. . . . 5 |- ( ( V e. _V /\ { <. K , E >. } e. _V ) -> (Vtx ` <. V , { <. K , E >. } >. ) = V )
24	16, 20, 23	syl2anc 415	. . . 4 |- ( ph -> (Vtx ` <. V , { <. K , E >. } >. ) = V )
25	6, 9, 12, 13	upgr1een 16348	. . . 4 |- ( ph -> <. V , { <. K , E >. } >. e. UPGraph )
26		p1evtxdeq.n	. . . 4 |- ( ph -> U e/ E )
27	22, 24, 6, 8, 9, 25, 14, 26	1hevtxdg0fi 16531	. . 3 |- ( ph -> ( (VtxDeg ` <. V , { <. K , E >. } >. ) ` U ) = 0 )
28	27	oveq2d 6095	. 2 |- ( ph -> ( ( (VtxDeg ` G ) ` U ) + ( (VtxDeg ` <. V , { <. K , E >. } >. ) ` U ) ) = ( ( (VtxDeg ` G ) ` U ) + 0 ) )
29		eqid 2238	. . . . . 6 |- dom I = dom I
30	1, 2, 29, 11, 9, 10	vtxdgfif 16517	. . . . 5 |- ( ph -> (VtxDeg ` G ) : V --> NN0 )
31	30, 8	ffvelcdmd 5838	. . . 4 |- ( ph -> ( (VtxDeg ` G ) ` U ) e. NN0 )
32	31	nn0cnd 9605	. . 3 |- ( ph -> ( (VtxDeg ` G ) ` U ) e. CC )
33	32	addridd 8469	. 2 |- ( ph -> ( ( (VtxDeg ` G ) ` U ) + 0 ) = ( (VtxDeg ` G ) ` U ) )
34	15, 28, 33	3eqtrd 2275	1 |- ( ph -> ( (VtxDeg ` F ) ` U ) = ( (VtxDeg ` G ) ` U ) )

Syntax hints:   -> wi 4   = wceq 1402   e. wcel 2209   e/ wnel 2515   _Vcvv 2821   u. cun 3218   ~Pcpw 3688   {csn 3708   <.cop 3711   class class class wbr 4128   dom cdm 4772   Fun wfun 5369   ` cfv 5375  (class class class)co 6079   2oc2o 6675   ~~ cen 7014   Fincfn 7016   0cc0 8173   + caddc 8176   NN0cn0 9546  Vtxcvtx 16236  iEdgciedg 16237  UPGraphcupgr 16315  VtxDegcvtxdg 16510

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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4244  ax-sep 4247  ax-nul 4257  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-setind 4682  ax-iinf 4733  ax-cnex 8264  ax-resscn 8265  ax-1cn 8266  ax-1re 8267  ax-icn 8268  ax-addcl 8269  ax-addrcl 8270  ax-mulcl 8271  ax-addcom 8273  ax-mulcom 8274  ax-addass 8275  ax-mulass 8276  ax-distr 8277  ax-i2m1 8278  ax-0lt1 8279  ax-1rid 8280  ax-0id 8281  ax-rnegex 8282  ax-cnre 8284  ax-pre-ltirr 8285  ax-pre-ltwlin 8286  ax-pre-lttrn 8287  ax-pre-apti 8288  ax-pre-ltadd 8289

This theorem depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-int 3969  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-tr 4228  df-id 4436  df-iord 4509  df-on 4511  df-ilim 4512  df-suc 4514  df-iom 4736  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-f1 5380  df-fo 5381  df-f1o 5382  df-fv 5383  df-riota 6032  df-ov 6082  df-oprab 6083  df-mpo 6084  df-1st 6368  df-2nd 6369  df-recs 6570  df-irdg 6635  df-frec 6656  df-1o 6681  df-2o 6682  df-oadd 6685  df-er 6801  df-en 7017  df-dom 7018  df-fin 7019  df-pnf 8356  df-mnf 8357  df-xr 8358  df-ltxr 8359  df-le 8360  df-sub 8493  df-neg 8494  df-inn 9288  df-2 9346  df-3 9347  df-4 9348  df-5 9349  df-6 9350  df-7 9351  df-8 9352  df-9 9353  df-n0 9547  df-z 9628  df-dec 9761  df-uz 9905  df-xadd 10158  df-fz 10395  df-ihash 11198  df-ndx 13338  df-slot 13339  df-base 13341  df-edgf 16229  df-vtx 16238  df-iedg 16239  df-upgren 16317  df-vtxdg 16511

This theorem is referenced by:  vdegp1aid  16538