Theorem uspgriedgedg 29323

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 29320	. . . . 5 ⊢ (𝐺 ∈ USPGraph → 𝐼:dom 𝐼–1-1-onto→(Edg‘𝐺))
3		f1of 6802	. . . . 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 6667	. . . . 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 236	. . 3 ⊢ (𝐺 ∈ USPGraph → 𝐼:dom 𝐼⟶𝐸)
9		fdmeu 6919	. . 3 ⊢ ((𝐼:dom 𝐼⟶𝐸 ∧ 𝑋 ∈ dom 𝐼) → ∃!𝑘 ∈ 𝐸 (𝐼‘𝑋) = 𝑘)
10	8, 9	sylan 589	. 2 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑋 ∈ dom 𝐼) → ∃!𝑘 ∈ 𝐸 (𝐼‘𝑋) = 𝑘)
11		eqcom 2768	. . 3 ⊢ (𝑘 = (𝐼‘𝑋) ↔ (𝐼‘𝑋) = 𝑘)
12	11	reubii 3375	. 2 ⊢ (∃!𝑘 ∈ 𝐸 𝑘 = (𝐼‘𝑋) ↔ ∃!𝑘 ∈ 𝐸 (𝐼‘𝑋) = 𝑘)
13	10, 12	sylibr 236	1 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑋 ∈ dom 𝐼) → ∃!𝑘 ∈ 𝐸 𝑘 = (𝐼‘𝑋))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 399   = wceq 1559   ∈ wcel 2141  ∃!wreu 3364  dom cdm 5645  ⟶wf 6513  –1-1-onto→wf1o 6516  ‘cfv 6517  iEdgciedg 29144  Edgcedg 29194  USPGraphcuspgr 29295

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5245  ax-nul 5255  ax-pr 5389  ax-un 7714

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-reu 3367  df-rab 3414  df-v 3455  df-sbc 3745  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-br 5100  df-opab 5162  df-mpt 5181  df-id 5540  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-iota 6473  df-fun 6519  df-fn 6520  df-f 6521  df-f1 6522  df-fo 6523  df-f1o 6524  df-fv 6525  df-edg 29195  df-uspgr 29297

This theorem is referenced by:  isuspgrim0  48480