Theorem upgrf 29180

Description: The edge function of an undirected pseudograph is a function into unordered pairs of vertices. Version of upgrfn 29181 without explicitly specified domain of the edge function. (Contributed by Mario Carneiro, 12-Mar-2015.) (Revised by AV, 10-Oct-2020.)

Hypotheses

Ref	Expression
isupgr.v	⊢ 𝑉 = (Vtx‘𝐺)
isupgr.e	⊢ 𝐸 = (iEdg‘𝐺)

Assertion

Ref	Expression
upgrf	⊢ (𝐺 ∈ UPGraph → 𝐸:dom 𝐸⟶{𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (♯‘𝑥) ≤ 2})

Distinct variable groups:   𝑥,𝐺   𝑥,𝑉

Allowed substitution hint:   𝐸(𝑥)

Proof of Theorem upgrf

Step	Hyp	Ref	Expression
1		isupgr.v	. . 3 ⊢ 𝑉 = (Vtx‘𝐺)
2		isupgr.e	. . 3 ⊢ 𝐸 = (iEdg‘𝐺)
3	1, 2	isupgr 29178	. 2 ⊢ (𝐺 ∈ UPGraph → (𝐺 ∈ UPGraph ↔ 𝐸:dom 𝐸⟶{𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (♯‘𝑥) ≤ 2}))
4	3	ibi 268	1 ⊢ (𝐺 ∈ UPGraph → 𝐸:dom 𝐸⟶{𝑥 ∈ (𝒫 𝑉 ∖ {∅}) ∣ (♯‘𝑥) ≤ 2})

Syntax hints:   → wi 4   = wceq 1547   ∈ wcel 2119  {crab 3392   ∖ cdif 3887  ∅c0 4268  𝒫 cpw 4536  {csn 4562   class class class wbr 5079  dom cdm 5625  ⟶wf 6488  ‘cfv 6492   ≤ cle 11178  2c2 12234  ♯chash 14290  Vtxcvtx 29090  iEdgciedg 29091  UPGraphcupgr 29174

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2712  ax-nul 5235

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-clab 2719  df-cleq 2732  df-clel 2815  df-ne 2936  df-rab 3393  df-v 3434  df-sbc 3731  df-dif 3893  df-un 3895  df-ss 3907  df-nul 4269  df-if 4462  df-pw 4538  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4846  df-br 5080  df-opab 5142  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-iota 6448  df-fun 6494  df-fn 6495  df-f 6496  df-fv 6500  df-upgr 29176

This theorem is referenced by:  upgrfn  29181  upgrss  29182  upgrop  29188  upgruhgr  29196  upgrun  29212  umgrislfupgr  29217  upgredgss  29226  edgupgr  29228  upgredg  29231  upgrreslem  29398  upgrres1  29407