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	⊢ (𝜑 → Fun 𝐼)
p1evtxdeq.fv	⊢ (𝜑 → (Vtx‘𝐹) = 𝑉)
p1evtxdeq.fi	⊢ (𝜑 → (iEdg‘𝐹) = (𝐼 ∪ {⟨𝐾, 𝐸⟩}))
p1evtxdeq.k	⊢ (𝜑 → 𝐾 ∈ 𝑋)
p1evtxdeq.d	⊢ (𝜑 → 𝐾 ∉ dom 𝐼)
p1evtxdeq.u	⊢ (𝜑 → 𝑈 ∈ 𝑉)
p1evtxdeqfi.vfi	⊢ (𝜑 → 𝑉 ∈ Fin)
p1evtxdeqfi.u	⊢ (𝜑 → 𝐺 ∈ UPGraph)
p1evtxdeqfi.ifi	⊢ (𝜑 → dom 𝐼 ∈ Fin)
p1evtxdeqfi.e	⊢ (𝜑 → 𝐸 ∈ 𝒫 𝑉)
p1evtxdeqfi.2o	⊢ (𝜑 → 𝐸 ≈ 2o)
p1evtxdeq.e	⊢ (𝜑 → 𝐸 ∈ 𝑌)
p1evtxdeq.n	⊢ (𝜑 → 𝑈 ∉ 𝐸)

Assertion

Ref	Expression
p1evtxdeqfi	⊢ (𝜑 → ((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 ⊢ (𝜑 → Fun 𝐼)
4		p1evtxdeq.fv	. . 3 ⊢ (𝜑 → (Vtx‘𝐹) = 𝑉)
5		p1evtxdeq.fi	. . 3 ⊢ (𝜑 → (iEdg‘𝐹) = (𝐼 ∪ {⟨𝐾, 𝐸⟩}))
6		p1evtxdeq.k	. . 3 ⊢ (𝜑 → 𝐾 ∈ 𝑋)
7		p1evtxdeq.d	. . 3 ⊢ (𝜑 → 𝐾 ∉ dom 𝐼)
8		p1evtxdeq.u	. . 3 ⊢ (𝜑 → 𝑈 ∈ 𝑉)
9		p1evtxdeqfi.vfi	. . 3 ⊢ (𝜑 → 𝑉 ∈ Fin)
10		p1evtxdeqfi.u	. . 3 ⊢ (𝜑 → 𝐺 ∈ UPGraph)
11		p1evtxdeqfi.ifi	. . 3 ⊢ (𝜑 → dom 𝐼 ∈ Fin)
12		p1evtxdeqfi.e	. . 3 ⊢ (𝜑 → 𝐸 ∈ 𝒫 𝑉)
13		p1evtxdeqfi.2o	. . 3 ⊢ (𝜑 → 𝐸 ≈ 2o)
14		p1evtxdeq.e	. . 3 ⊢ (𝜑 → 𝐸 ∈ 𝑌)
15	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14	p1evtxdeqfilem 16535	. 2 ⊢ (𝜑 → ((VtxDeg‘𝐹)‘𝑈) = (((VtxDeg‘𝐺)‘𝑈) + ((VtxDeg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩)‘𝑈)))
16	9	elexd 2835	. . . . 5 ⊢ (𝜑 → 𝑉 ∈ V)
17		opexg 4366	. . . . . . 7 ⊢ ((𝐾 ∈ 𝑋 ∧ 𝐸 ∈ 𝒫 𝑉) → ⟨𝐾, 𝐸⟩ ∈ V)
18	6, 12, 17	syl2anc 415	. . . . . 6 ⊢ (𝜑 → ⟨𝐾, 𝐸⟩ ∈ V)
19		snexg 4319	. . . . . 6 ⊢ (⟨𝐾, 𝐸⟩ ∈ V → {⟨𝐾, 𝐸⟩} ∈ V)
20	18, 19	syl 14	. . . . 5 ⊢ (𝜑 → {⟨𝐾, 𝐸⟩} ∈ V)
21		opiedgfv 16249	. . . . 5 ⊢ ((𝑉 ∈ V ∧ {⟨𝐾, 𝐸⟩} ∈ V) → (iEdg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩) = {⟨𝐾, 𝐸⟩})
22	16, 20, 21	syl2anc 415	. . . 4 ⊢ (𝜑 → (iEdg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩) = {⟨𝐾, 𝐸⟩})
23		opvtxfv 16246	. . . . 5 ⊢ ((𝑉 ∈ V ∧ {⟨𝐾, 𝐸⟩} ∈ V) → (Vtx‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩) = 𝑉)
24	16, 20, 23	syl2anc 415	. . . 4 ⊢ (𝜑 → (Vtx‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩) = 𝑉)
25	6, 9, 12, 13	upgr1een 16348	. . . 4 ⊢ (𝜑 → ⟨𝑉, {⟨𝐾, 𝐸⟩}⟩ ∈ UPGraph)
26		p1evtxdeq.n	. . . 4 ⊢ (𝜑 → 𝑈 ∉ 𝐸)
27	22, 24, 6, 8, 9, 25, 14, 26	1hevtxdg0fi 16531	. . 3 ⊢ (𝜑 → ((VtxDeg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩)‘𝑈) = 0)
28	27	oveq2d 6095	. 2 ⊢ (𝜑 → (((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 ⊢ (𝜑 → (VtxDeg‘𝐺):𝑉⟶ℕ0)
31	30, 8	ffvelcdmd 5838	. . . 4 ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝑈) ∈ ℕ0)
32	31	nn0cnd 9605	. . 3 ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝑈) ∈ ℂ)
33	32	addridd 8469	. 2 ⊢ (𝜑 → (((VtxDeg‘𝐺)‘𝑈) + 0) = ((VtxDeg‘𝐺)‘𝑈))
34	15, 28, 33	3eqtrd 2275	1 ⊢ (𝜑 → ((VtxDeg‘𝐹)‘𝑈) = ((VtxDeg‘𝐺)‘𝑈))

Syntax hints:   → wi 4   = wceq 1402   ∈ wcel 2209   ∉ wnel 2515  Vcvv 2821   ∪ cun 3218  𝒫 cpw 3688  {csn 3708  ⟨cop 3711   class class class wbr 4128  dom cdm 4772  Fun wfun 5369  ‘cfv 5375  (class class class)co 6079  2_oc2o 6675   ≈ cen 7014  Fincfn 7016  0cc0 8173   + caddc 8176  ℕ₀cn0 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