Theorem griedg0ssusgr 27049

Description: The class of all simple graphs is a superclass of the class of empty graphs represented as ordered pairs. (Contributed by AV, 27-Dec-2020.)

Hypothesis

Ref	Expression
griedg0prc.u	⊢ 𝑈 = {⟨𝑣, 𝑒⟩ ∣ 𝑒:∅⟶∅}

Assertion

Ref	Expression
griedg0ssusgr	⊢ 𝑈 ⊆ USGraph

Distinct variable group:   𝑣,𝑒

Allowed substitution hints:   𝑈(𝑣,𝑒)

Proof of Theorem griedg0ssusgr

Dummy variable 𝑔 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		griedg0prc.u	. . . . 5 ⊢ 𝑈 = {⟨𝑣, 𝑒⟩ ∣ 𝑒:∅⟶∅}
2	1	eleq2i 2906	. . . 4 ⊢ (𝑔 ∈ 𝑈 ↔ 𝑔 ∈ {⟨𝑣, 𝑒⟩ ∣ 𝑒:∅⟶∅})
3		elopab 5416	. . . 4 ⊢ (𝑔 ∈ {⟨𝑣, 𝑒⟩ ∣ 𝑒:∅⟶∅} ↔ ∃𝑣∃𝑒(𝑔 = ⟨𝑣, 𝑒⟩ ∧ 𝑒:∅⟶∅))
4	2, 3	bitri 277	. . 3 ⊢ (𝑔 ∈ 𝑈 ↔ ∃𝑣∃𝑒(𝑔 = ⟨𝑣, 𝑒⟩ ∧ 𝑒:∅⟶∅))
5		opex 5358	. . . . . . . 8 ⊢ ⟨𝑣, 𝑒⟩ ∈ V
6	5	a1i 11	. . . . . . 7 ⊢ (𝑒:∅⟶∅ → ⟨𝑣, 𝑒⟩ ∈ V)
7		vex 3499	. . . . . . . . 9 ⊢ 𝑣 ∈ V
8		vex 3499	. . . . . . . . 9 ⊢ 𝑒 ∈ V
9	7, 8	opiedgfvi 26797	. . . . . . . 8 ⊢ (iEdg‘⟨𝑣, 𝑒⟩) = 𝑒
10		f0bi 6564	. . . . . . . . 9 ⊢ (𝑒:∅⟶∅ ↔ 𝑒 = ∅)
11	10	biimpi 218	. . . . . . . 8 ⊢ (𝑒:∅⟶∅ → 𝑒 = ∅)
12	9, 11	syl5eq 2870	. . . . . . 7 ⊢ (𝑒:∅⟶∅ → (iEdg‘⟨𝑣, 𝑒⟩) = ∅)
13	6, 12	usgr0e 27020	. . . . . 6 ⊢ (𝑒:∅⟶∅ → ⟨𝑣, 𝑒⟩ ∈ USGraph)
14	13	adantl 484	. . . . 5 ⊢ ((𝑔 = ⟨𝑣, 𝑒⟩ ∧ 𝑒:∅⟶∅) → ⟨𝑣, 𝑒⟩ ∈ USGraph)
15		eleq1 2902	. . . . . 6 ⊢ (𝑔 = ⟨𝑣, 𝑒⟩ → (𝑔 ∈ USGraph ↔ ⟨𝑣, 𝑒⟩ ∈ USGraph))
16	15	adantr 483	. . . . 5 ⊢ ((𝑔 = ⟨𝑣, 𝑒⟩ ∧ 𝑒:∅⟶∅) → (𝑔 ∈ USGraph ↔ ⟨𝑣, 𝑒⟩ ∈ USGraph))
17	14, 16	mpbird 259	. . . 4 ⊢ ((𝑔 = ⟨𝑣, 𝑒⟩ ∧ 𝑒:∅⟶∅) → 𝑔 ∈ USGraph)
18	17	exlimivv 1933	. . 3 ⊢ (∃𝑣∃𝑒(𝑔 = ⟨𝑣, 𝑒⟩ ∧ 𝑒:∅⟶∅) → 𝑔 ∈ USGraph)
19	4, 18	sylbi 219	. 2 ⊢ (𝑔 ∈ 𝑈 → 𝑔 ∈ USGraph)
20	19	ssriv 3973	1 ⊢ 𝑈 ⊆ USGraph

Syntax hints:   ↔ wb 208   ∧ wa 398   = wceq 1537  ∃wex 1780   ∈ wcel 2114  Vcvv 3496   ⊆ wss 3938  ∅c0 4293  ⟨cop 4575  {copab 5130  ⟶wf 6353  ‘cfv 6357  iEdgciedg 26784  USGraphcusgr 26936

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ral 3145  df-rex 3146  df-rab 3149  df-v 3498  df-sbc 3775  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-br 5069  df-opab 5131  df-mpt 5149  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fv 6365  df-2nd 7692  df-iedg 26786  df-usgr 26938

This theorem is referenced by:  usgrprc  27050