Theorem uspgriedgedg 29270

Description: In a simple pseudograph, for each indexed edge there is exactly one edge. (Contributed by AV, 20-Apr-2025.)

Hypotheses

Ref	Expression
uspgredgiedg.e	⊢ 𝐸 = (Edg‘𝐺)
uspgredgiedg.i	⊢ 𝐼 = (iEdg‘𝐺)

Assertion

Ref	Expression
uspgriedgedg	⊢ ((𝐺 ∈ USPGraph ∧ 𝑋 ∈ dom 𝐼) → ∃!𝑘 ∈ 𝐸 𝑘 = (𝐼‘𝑋))

Distinct variable groups:   𝑘,𝐸   𝑘,𝐼   𝑘,𝑋

Allowed substitution hint:   𝐺(𝑘)

Proof of Theorem uspgriedgedg

Step	Hyp	Ref	Expression
1		uspgredgiedg.i	. . . . . 6 ⊢ 𝐼 = (iEdg‘𝐺)
2	1	uspgrf1oedg 29267	. . . . 5 ⊢ (𝐺 ∈ USPGraph → 𝐼:dom 𝐼–1-1-onto→(Edg‘𝐺))
3		f1of 6774	. . . . 5 ⊢ (𝐼:dom 𝐼–1-1-onto→(Edg‘𝐺) → 𝐼:dom 𝐼⟶(Edg‘𝐺))
4	2, 3	syl 17	. . . 4 ⊢ (𝐺 ∈ USPGraph → 𝐼:dom 𝐼⟶(Edg‘𝐺))
5		uspgredgiedg.e	. . . . 5 ⊢ 𝐸 = (Edg‘𝐺)
6		feq3 6642	. . . . 5 ⊢ (𝐸 = (Edg‘𝐺) → (𝐼:dom 𝐼⟶𝐸 ↔ 𝐼:dom 𝐼⟶(Edg‘𝐺)))
7	5, 6	ax-mp 5	. . . 4 ⊢ (𝐼:dom 𝐼⟶𝐸 ↔ 𝐼:dom 𝐼⟶(Edg‘𝐺))
8	4, 7	sylibr 235	. . 3 ⊢ (𝐺 ∈ USPGraph → 𝐼:dom 𝐼⟶𝐸)
9		fdmeu 6890	. . 3 ⊢ ((𝐼:dom 𝐼⟶𝐸 ∧ 𝑋 ∈ dom 𝐼) → ∃!𝑘 ∈ 𝐸 (𝐼‘𝑋) = 𝑘)
10	8, 9	sylan 586	. 2 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑋 ∈ dom 𝐼) → ∃!𝑘 ∈ 𝐸 (𝐼‘𝑋) = 𝑘)
11		eqcom 2747	. . 3 ⊢ (𝑘 = (𝐼‘𝑋) ↔ (𝐼‘𝑋) = 𝑘)
12	11	reubii 3354	. 2 ⊢ (∃!𝑘 ∈ 𝐸 𝑘 = (𝐼‘𝑋) ↔ ∃!𝑘 ∈ 𝐸 (𝐼‘𝑋) = 𝑘)
13	10, 12	sylibr 235	1 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑋 ∈ dom 𝐼) → ∃!𝑘 ∈ 𝐸 𝑘 = (𝐼‘𝑋))

Syntax hints:   → wi 4   ↔ wb 207   ∧ wa 396   = wceq 1547   ∈ wcel 2119  ∃!wreu 3343  dom cdm 5625  ⟶wf 6488  –1-1-onto→wf1o 6491  ‘cfv 6492  iEdgciedg 29091  Edgcedg 29141  USPGraphcuspgr 29242

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-10 2152  ax-11 2168  ax-12 2189  ax-ext 2712  ax-sep 5225  ax-nul 5235  ax-pr 5369  ax-un 7685

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-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2719  df-cleq 2732  df-clel 2815  df-nfc 2889  df-ne 2936  df-ral 3055  df-rex 3065  df-reu 3346  df-rab 3393  df-v 3434  df-sbc 3731  df-dif 3893  df-un 3895  df-in 3897  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-mpt 5161  df-id 5520  df-xp 5631  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-f1 6497  df-fo 6498  df-f1o 6499  df-fv 6500  df-edg 29142  df-uspgr 29244

This theorem is referenced by:  isuspgrim0  48392