Theorem p1evtxdeqfi 16324

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 16323	. 2 ⊢ (𝜑 → ((VtxDeg‘𝐹)‘𝑈) = (((VtxDeg‘𝐺)‘𝑈) + ((VtxDeg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩)‘𝑈)))
16	9	elexd 2829	. . . . 5 ⊢ (𝜑 → 𝑉 ∈ V)
17		opexg 4346	. . . . . . 7 ⊢ ((𝐾 ∈ 𝑋 ∧ 𝐸 ∈ 𝒫 𝑉) → ⟨𝐾, 𝐸⟩ ∈ V)
18	6, 12, 17	syl2anc 411	. . . . . 6 ⊢ (𝜑 → ⟨𝐾, 𝐸⟩ ∈ V)
19		snexg 4299	. . . . . 6 ⊢ (⟨𝐾, 𝐸⟩ ∈ V → {⟨𝐾, 𝐸⟩} ∈ V)
20	18, 19	syl 14	. . . . 5 ⊢ (𝜑 → {⟨𝐾, 𝐸⟩} ∈ V)
21		opiedgfv 16037	. . . . 5 ⊢ ((𝑉 ∈ V ∧ {⟨𝐾, 𝐸⟩} ∈ V) → (iEdg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩) = {⟨𝐾, 𝐸⟩})
22	16, 20, 21	syl2anc 411	. . . 4 ⊢ (𝜑 → (iEdg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩) = {⟨𝐾, 𝐸⟩})
23		opvtxfv 16034	. . . . 5 ⊢ ((𝑉 ∈ V ∧ {⟨𝐾, 𝐸⟩} ∈ V) → (Vtx‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩) = 𝑉)
24	16, 20, 23	syl2anc 411	. . . 4 ⊢ (𝜑 → (Vtx‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩) = 𝑉)
25	6, 9, 12, 13	upgr1een 16136	. . . 4 ⊢ (𝜑 → ⟨𝑉, {⟨𝐾, 𝐸⟩}⟩ ∈ UPGraph)
26		p1evtxdeq.n	. . . 4 ⊢ (𝜑 → 𝑈 ∉ 𝐸)
27	22, 24, 6, 8, 9, 25, 14, 26	1hevtxdg0fi 16319	. . 3 ⊢ (𝜑 → ((VtxDeg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩)‘𝑈) = 0)
28	27	oveq2d 6068	. 2 ⊢ (𝜑 → (((VtxDeg‘𝐺)‘𝑈) + ((VtxDeg‘⟨𝑉, {⟨𝐾, 𝐸⟩}⟩)‘𝑈)) = (((VtxDeg‘𝐺)‘𝑈) + 0))
29		eqid 2234	. . . . . 6 ⊢ dom 𝐼 = dom 𝐼
30	1, 2, 29, 11, 9, 10	vtxdgfif 16305	. . . . 5 ⊢ (𝜑 → (VtxDeg‘𝐺):𝑉⟶ℕ0)
31	30, 8	ffvelcdmd 5815	. . . 4 ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝑈) ∈ ℕ0)
32	31	nn0cnd 9557	. . 3 ⊢ (𝜑 → ((VtxDeg‘𝐺)‘𝑈) ∈ ℂ)
33	32	addridd 8424	. 2 ⊢ (𝜑 → (((VtxDeg‘𝐺)‘𝑈) + 0) = ((VtxDeg‘𝐺)‘𝑈))
34	15, 28, 33	3eqtrd 2271	1 ⊢ (𝜑 → ((VtxDeg‘𝐹)‘𝑈) = ((VtxDeg‘𝐺)‘𝑈))

Syntax hints:   → wi 4   = wceq 1398   ∈ wcel 2205   ∉ wnel 2509  Vcvv 2815   ∪ cun 3211  𝒫 cpw 3671  {csn 3691  ⟨cop 3694   class class class wbr 4111  dom cdm 4751  Fun wfun 5348  ‘cfv 5354  (class class class)co 6052  2_oc2o 6643   ≈ cen 6975  Fincfn 6977  0cc0 8129   + caddc 8132  ℕ₀cn0 9498  Vtxcvtx 16024  iEdgciedg 16025  UPGraphcupgr 16103  VtxDegcvtxdg 16298

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 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-nul 4238  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-iinf 4712  ax-cnex 8220  ax-resscn 8221  ax-1cn 8222  ax-1re 8223  ax-icn 8224  ax-addcl 8225  ax-addrcl 8226  ax-mulcl 8227  ax-addcom 8229  ax-mulcom 8230  ax-addass 8231  ax-mulass 8232  ax-distr 8233  ax-i2m1 8234  ax-0lt1 8235  ax-1rid 8236  ax-0id 8237  ax-rnegex 8238  ax-cnre 8240  ax-pre-ltirr 8241  ax-pre-ltwlin 8242  ax-pre-lttrn 8243  ax-pre-apti 8244  ax-pre-ltadd 8245

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 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-if 3623  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-tr 4211  df-id 4416  df-iord 4489  df-on 4491  df-ilim 4492  df-suc 4494  df-iom 4715  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-riota 6005  df-ov 6055  df-oprab 6056  df-mpo 6057  df-1st 6336  df-2nd 6337  df-recs 6538  df-irdg 6603  df-frec 6624  df-1o 6649  df-2o 6650  df-oadd 6653  df-er 6769  df-en 6978  df-dom 6979  df-fin 6980  df-pnf 8312  df-mnf 8313  df-xr 8314  df-ltxr 8315  df-le 8316  df-sub 8448  df-neg 8449  df-inn 9240  df-2 9298  df-3 9299  df-4 9300  df-5 9301  df-6 9302  df-7 9303  df-8 9304  df-9 9305  df-n0 9499  df-z 9580  df-dec 9713  df-uz 9857  df-xadd 10109  df-fz 10346  df-ihash 11143  df-ndx 13232  df-slot 13233  df-base 13235  df-edgf 16017  df-vtx 16026  df-iedg 16027  df-upgren 16105  df-vtxdg 16299

This theorem is referenced by:  vdegp1aid  16326