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Theorem uspgredgdomord 15992
Description: In a simple pseudograph the number of edges which contain a given vertex is not greater than the number of vertices. (Contributed by Alexander van der Vekens, 4-Jan-2018.) (Revised by AV, 6-Dec-2020.)
Hypotheses
Ref Expression
usgredgleord.v 𝑉 = (Vtx‘𝐺)
usgredgleord.e 𝐸 = (Edg‘𝐺)
Assertion
Ref Expression
uspgredgdomord ((𝐺 ∈ USPGraph ∧ 𝑁𝑉) → {𝑒𝐸𝑁𝑒} ≼ 𝑉)
Distinct variable groups:   𝑒,𝐸   𝑒,𝑁
Allowed substitution hints:   𝐺(𝑒)   𝑉(𝑒)

Proof of Theorem uspgredgdomord
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 usgredgleord.v . . 3 𝑉 = (Vtx‘𝐺)
2 usgredgleord.e . . 3 𝐸 = (Edg‘𝐺)
3 eqid 2209 . . 3 {𝑒𝐸𝑁𝑒} = {𝑒𝐸𝑁𝑒}
4 eqid 2209 . . 3 (𝑥 ∈ {𝑒𝐸𝑁𝑒} ↦ (𝑦𝑉 𝑥 = {𝑁, 𝑦})) = (𝑥 ∈ {𝑒𝐸𝑁𝑒} ↦ (𝑦𝑉 𝑥 = {𝑁, 𝑦}))
51, 2, 3, 4uspgredg2v 15984 . 2 ((𝐺 ∈ USPGraph ∧ 𝑁𝑉) → (𝑥 ∈ {𝑒𝐸𝑁𝑒} ↦ (𝑦𝑉 𝑥 = {𝑁, 𝑦})):{𝑒𝐸𝑁𝑒}–1-1𝑉)
6 vtxex 15784 . . . . 5 (𝐺 ∈ USPGraph → (Vtx‘𝐺) ∈ V)
71, 6eqeltrid 2296 . . . 4 (𝐺 ∈ USPGraph → 𝑉 ∈ V)
8 f1domg 6879 . . . 4 (𝑉 ∈ V → ((𝑥 ∈ {𝑒𝐸𝑁𝑒} ↦ (𝑦𝑉 𝑥 = {𝑁, 𝑦})):{𝑒𝐸𝑁𝑒}–1-1𝑉 → {𝑒𝐸𝑁𝑒} ≼ 𝑉))
97, 8syl 14 . . 3 (𝐺 ∈ USPGraph → ((𝑥 ∈ {𝑒𝐸𝑁𝑒} ↦ (𝑦𝑉 𝑥 = {𝑁, 𝑦})):{𝑒𝐸𝑁𝑒}–1-1𝑉 → {𝑒𝐸𝑁𝑒} ≼ 𝑉))
109adantr 276 . 2 ((𝐺 ∈ USPGraph ∧ 𝑁𝑉) → ((𝑥 ∈ {𝑒𝐸𝑁𝑒} ↦ (𝑦𝑉 𝑥 = {𝑁, 𝑦})):{𝑒𝐸𝑁𝑒}–1-1𝑉 → {𝑒𝐸𝑁𝑒} ≼ 𝑉))
115, 10mpd 13 1 ((𝐺 ∈ USPGraph ∧ 𝑁𝑉) → {𝑒𝐸𝑁𝑒} ≼ 𝑉)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1375  wcel 2180  {crab 2492  Vcvv 2779  {cpr 3647   class class class wbr 4062  cmpt 4124  1-1wf1 5291  cfv 5294  crio 5926  cdom 6856  Vtxcvtx 15778  Edgcedg 15823  USPGraphcuspgr 15916
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 617  ax-in2 618  ax-io 713  ax-5 1473  ax-7 1474  ax-gen 1475  ax-ie1 1519  ax-ie2 1520  ax-8 1530  ax-10 1531  ax-11 1532  ax-i12 1533  ax-bndl 1535  ax-4 1536  ax-17 1552  ax-i9 1556  ax-ial 1560  ax-i5r 1561  ax-13 2182  ax-14 2183  ax-ext 2191  ax-coll 4178  ax-sep 4181  ax-nul 4189  ax-pow 4237  ax-pr 4272  ax-un 4501  ax-setind 4606  ax-cnex 8058  ax-resscn 8059  ax-1cn 8060  ax-1re 8061  ax-icn 8062  ax-addcl 8063  ax-addrcl 8064  ax-mulcl 8065  ax-addcom 8067  ax-mulcom 8068  ax-addass 8069  ax-mulass 8070  ax-distr 8071  ax-i2m1 8072  ax-1rid 8074  ax-0id 8075  ax-rnegex 8076  ax-cnre 8078
This theorem depends on definitions:  df-bi 117  df-3an 985  df-tru 1378  df-fal 1381  df-nf 1487  df-sb 1789  df-eu 2060  df-mo 2061  df-clab 2196  df-cleq 2202  df-clel 2205  df-nfc 2341  df-ne 2381  df-ral 2493  df-rex 2494  df-reu 2495  df-rmo 2496  df-rab 2497  df-v 2781  df-sbc 3009  df-csb 3105  df-dif 3179  df-un 3181  df-in 3183  df-ss 3190  df-nul 3472  df-if 3583  df-pw 3631  df-sn 3652  df-pr 3653  df-op 3655  df-uni 3868  df-int 3903  df-iun 3946  df-br 4063  df-opab 4125  df-mpt 4126  df-tr 4162  df-id 4361  df-iord 4434  df-on 4436  df-suc 4439  df-xp 4702  df-rel 4703  df-cnv 4704  df-co 4705  df-dm 4706  df-rn 4707  df-res 4708  df-ima 4709  df-iota 5254  df-fun 5296  df-fn 5297  df-f 5298  df-f1 5299  df-fo 5300  df-f1o 5301  df-fv 5302  df-riota 5927  df-ov 5977  df-oprab 5978  df-mpo 5979  df-1st 6256  df-2nd 6257  df-1o 6532  df-2o 6533  df-en 6858  df-dom 6859  df-sub 8287  df-inn 9079  df-2 9137  df-3 9138  df-4 9139  df-5 9140  df-6 9141  df-7 9142  df-8 9143  df-9 9144  df-n0 9338  df-dec 9547  df-ndx 13001  df-slot 13002  df-base 13004  df-edgf 15771  df-vtx 15780  df-iedg 15781  df-edg 15824  df-upgren 15858  df-uspgren 15918
This theorem is referenced by:  usgredgdomord  15993
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