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Theorem cusgrfilem2 40672
 Description: Lemma 2 for cusgrfi 40674. (Contributed by Alexander van der Vekens, 13-Jan-2018.) (Revised by AV, 11-Nov-2020.)
Hypotheses
Ref Expression
cusgrfi.v 𝑉 = (Vtx‘𝐺)
cusgrfi.p 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎𝑉 (𝑎𝑁𝑥 = {𝑎, 𝑁})}
cusgrfi.f 𝐹 = (𝑥 ∈ (𝑉 ∖ {𝑁}) ↦ {𝑥, 𝑁})
Assertion
Ref Expression
cusgrfilem2 (𝑁𝑉𝐹:(𝑉 ∖ {𝑁})–1-1-onto𝑃)
Distinct variable groups:   𝑥,𝐺   𝑁,𝑎,𝑥   𝑉,𝑎,𝑥   𝑥,𝑃
Allowed substitution hints:   𝑃(𝑎)   𝐹(𝑥,𝑎)   𝐺(𝑎)

Proof of Theorem cusgrfilem2
Dummy variables 𝑒 𝑣 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eldifi 3694 . . . . 5 (𝑥 ∈ (𝑉 ∖ {𝑁}) → 𝑥𝑉)
2 id 22 . . . . 5 (𝑁𝑉𝑁𝑉)
3 prelpwi 4842 . . . . 5 ((𝑥𝑉𝑁𝑉) → {𝑥, 𝑁} ∈ 𝒫 𝑉)
41, 2, 3syl2anr 494 . . . 4 ((𝑁𝑉𝑥 ∈ (𝑉 ∖ {𝑁})) → {𝑥, 𝑁} ∈ 𝒫 𝑉)
51adantl 481 . . . . 5 ((𝑁𝑉𝑥 ∈ (𝑉 ∖ {𝑁})) → 𝑥𝑉)
6 eldifsni 4261 . . . . . . 7 (𝑥 ∈ (𝑉 ∖ {𝑁}) → 𝑥𝑁)
76adantl 481 . . . . . 6 ((𝑁𝑉𝑥 ∈ (𝑉 ∖ {𝑁})) → 𝑥𝑁)
8 eqidd 2611 . . . . . 6 ((𝑁𝑉𝑥 ∈ (𝑉 ∖ {𝑁})) → {𝑥, 𝑁} = {𝑥, 𝑁})
97, 8jca 553 . . . . 5 ((𝑁𝑉𝑥 ∈ (𝑉 ∖ {𝑁})) → (𝑥𝑁 ∧ {𝑥, 𝑁} = {𝑥, 𝑁}))
10 id 22 . . . . . 6 (𝑥𝑉𝑥𝑉)
11 neeq1 2844 . . . . . . . 8 (𝑎 = 𝑥 → (𝑎𝑁𝑥𝑁))
12 preq1 4212 . . . . . . . . 9 (𝑎 = 𝑥 → {𝑎, 𝑁} = {𝑥, 𝑁})
1312eqeq2d 2620 . . . . . . . 8 (𝑎 = 𝑥 → ({𝑥, 𝑁} = {𝑎, 𝑁} ↔ {𝑥, 𝑁} = {𝑥, 𝑁}))
1411, 13anbi12d 743 . . . . . . 7 (𝑎 = 𝑥 → ((𝑎𝑁 ∧ {𝑥, 𝑁} = {𝑎, 𝑁}) ↔ (𝑥𝑁 ∧ {𝑥, 𝑁} = {𝑥, 𝑁})))
1514adantl 481 . . . . . 6 ((𝑥𝑉𝑎 = 𝑥) → ((𝑎𝑁 ∧ {𝑥, 𝑁} = {𝑎, 𝑁}) ↔ (𝑥𝑁 ∧ {𝑥, 𝑁} = {𝑥, 𝑁})))
1610, 15rspcedv 3286 . . . . 5 (𝑥𝑉 → ((𝑥𝑁 ∧ {𝑥, 𝑁} = {𝑥, 𝑁}) → ∃𝑎𝑉 (𝑎𝑁 ∧ {𝑥, 𝑁} = {𝑎, 𝑁})))
175, 9, 16sylc 63 . . . 4 ((𝑁𝑉𝑥 ∈ (𝑉 ∖ {𝑁})) → ∃𝑎𝑉 (𝑎𝑁 ∧ {𝑥, 𝑁} = {𝑎, 𝑁}))
18 cusgrfi.p . . . . . 6 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎𝑉 (𝑎𝑁𝑥 = {𝑎, 𝑁})}
1918eleq2i 2680 . . . . 5 ({𝑥, 𝑁} ∈ 𝑃 ↔ {𝑥, 𝑁} ∈ {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎𝑉 (𝑎𝑁𝑥 = {𝑎, 𝑁})})
20 eqeq1 2614 . . . . . . . 8 (𝑣 = {𝑥, 𝑁} → (𝑣 = {𝑎, 𝑁} ↔ {𝑥, 𝑁} = {𝑎, 𝑁}))
2120anbi2d 736 . . . . . . 7 (𝑣 = {𝑥, 𝑁} → ((𝑎𝑁𝑣 = {𝑎, 𝑁}) ↔ (𝑎𝑁 ∧ {𝑥, 𝑁} = {𝑎, 𝑁})))
2221rexbidv 3034 . . . . . 6 (𝑣 = {𝑥, 𝑁} → (∃𝑎𝑉 (𝑎𝑁𝑣 = {𝑎, 𝑁}) ↔ ∃𝑎𝑉 (𝑎𝑁 ∧ {𝑥, 𝑁} = {𝑎, 𝑁})))
23 eqeq1 2614 . . . . . . . . 9 (𝑥 = 𝑣 → (𝑥 = {𝑎, 𝑁} ↔ 𝑣 = {𝑎, 𝑁}))
2423anbi2d 736 . . . . . . . 8 (𝑥 = 𝑣 → ((𝑎𝑁𝑥 = {𝑎, 𝑁}) ↔ (𝑎𝑁𝑣 = {𝑎, 𝑁})))
2524rexbidv 3034 . . . . . . 7 (𝑥 = 𝑣 → (∃𝑎𝑉 (𝑎𝑁𝑥 = {𝑎, 𝑁}) ↔ ∃𝑎𝑉 (𝑎𝑁𝑣 = {𝑎, 𝑁})))
2625cbvrabv 3172 . . . . . 6 {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎𝑉 (𝑎𝑁𝑥 = {𝑎, 𝑁})} = {𝑣 ∈ 𝒫 𝑉 ∣ ∃𝑎𝑉 (𝑎𝑁𝑣 = {𝑎, 𝑁})}
2722, 26elrab2 3333 . . . . 5 ({𝑥, 𝑁} ∈ {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎𝑉 (𝑎𝑁𝑥 = {𝑎, 𝑁})} ↔ ({𝑥, 𝑁} ∈ 𝒫 𝑉 ∧ ∃𝑎𝑉 (𝑎𝑁 ∧ {𝑥, 𝑁} = {𝑎, 𝑁})))
2819, 27bitri 263 . . . 4 ({𝑥, 𝑁} ∈ 𝑃 ↔ ({𝑥, 𝑁} ∈ 𝒫 𝑉 ∧ ∃𝑎𝑉 (𝑎𝑁 ∧ {𝑥, 𝑁} = {𝑎, 𝑁})))
294, 17, 28sylanbrc 695 . . 3 ((𝑁𝑉𝑥 ∈ (𝑉 ∖ {𝑁})) → {𝑥, 𝑁} ∈ 𝑃)
3029ralrimiva 2949 . 2 (𝑁𝑉 → ∀𝑥 ∈ (𝑉 ∖ {𝑁}){𝑥, 𝑁} ∈ 𝑃)
31 simpl 472 . . . . . . . . . . 11 ((𝑎𝑁𝑒 = {𝑎, 𝑁}) → 𝑎𝑁)
3231anim2i 591 . . . . . . . . . 10 ((𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁})) → (𝑎𝑉𝑎𝑁))
3332adantl 481 . . . . . . . . 9 (((𝑁𝑉𝑒 ∈ 𝒫 𝑉) ∧ (𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁}))) → (𝑎𝑉𝑎𝑁))
34 eldifsn 4260 . . . . . . . . 9 (𝑎 ∈ (𝑉 ∖ {𝑁}) ↔ (𝑎𝑉𝑎𝑁))
3533, 34sylibr 223 . . . . . . . 8 (((𝑁𝑉𝑒 ∈ 𝒫 𝑉) ∧ (𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁}))) → 𝑎 ∈ (𝑉 ∖ {𝑁}))
36 eqeq1 2614 . . . . . . . . . . . . . 14 (𝑒 = {𝑎, 𝑁} → (𝑒 = {𝑥, 𝑁} ↔ {𝑎, 𝑁} = {𝑥, 𝑁}))
3736adantl 481 . . . . . . . . . . . . 13 ((𝑎𝑁𝑒 = {𝑎, 𝑁}) → (𝑒 = {𝑥, 𝑁} ↔ {𝑎, 𝑁} = {𝑥, 𝑁}))
3837ad2antlr 759 . . . . . . . . . . . 12 (((𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁})) ∧ 𝑥 ∈ (𝑉 ∖ {𝑁})) → (𝑒 = {𝑥, 𝑁} ↔ {𝑎, 𝑁} = {𝑥, 𝑁}))
39 vex 3176 . . . . . . . . . . . . . 14 𝑎 ∈ V
40 vex 3176 . . . . . . . . . . . . . 14 𝑥 ∈ V
4139, 40preqr1 4319 . . . . . . . . . . . . 13 ({𝑎, 𝑁} = {𝑥, 𝑁} → 𝑎 = 𝑥)
4241equcomd 1933 . . . . . . . . . . . 12 ({𝑎, 𝑁} = {𝑥, 𝑁} → 𝑥 = 𝑎)
4338, 42syl6bi 242 . . . . . . . . . . 11 (((𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁})) ∧ 𝑥 ∈ (𝑉 ∖ {𝑁})) → (𝑒 = {𝑥, 𝑁} → 𝑥 = 𝑎))
4443adantll 746 . . . . . . . . . 10 ((((𝑁𝑉𝑒 ∈ 𝒫 𝑉) ∧ (𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁}))) ∧ 𝑥 ∈ (𝑉 ∖ {𝑁})) → (𝑒 = {𝑥, 𝑁} → 𝑥 = 𝑎))
4512equcoms 1934 . . . . . . . . . . . . . . 15 (𝑥 = 𝑎 → {𝑎, 𝑁} = {𝑥, 𝑁})
4645eqeq2d 2620 . . . . . . . . . . . . . 14 (𝑥 = 𝑎 → (𝑒 = {𝑎, 𝑁} ↔ 𝑒 = {𝑥, 𝑁}))
4746biimpcd 238 . . . . . . . . . . . . 13 (𝑒 = {𝑎, 𝑁} → (𝑥 = 𝑎𝑒 = {𝑥, 𝑁}))
4847adantl 481 . . . . . . . . . . . 12 ((𝑎𝑁𝑒 = {𝑎, 𝑁}) → (𝑥 = 𝑎𝑒 = {𝑥, 𝑁}))
4948adantl 481 . . . . . . . . . . 11 ((𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁})) → (𝑥 = 𝑎𝑒 = {𝑥, 𝑁}))
5049ad2antlr 759 . . . . . . . . . 10 ((((𝑁𝑉𝑒 ∈ 𝒫 𝑉) ∧ (𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁}))) ∧ 𝑥 ∈ (𝑉 ∖ {𝑁})) → (𝑥 = 𝑎𝑒 = {𝑥, 𝑁}))
5144, 50impbid 201 . . . . . . . . 9 ((((𝑁𝑉𝑒 ∈ 𝒫 𝑉) ∧ (𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁}))) ∧ 𝑥 ∈ (𝑉 ∖ {𝑁})) → (𝑒 = {𝑥, 𝑁} ↔ 𝑥 = 𝑎))
5251ralrimiva 2949 . . . . . . . 8 (((𝑁𝑉𝑒 ∈ 𝒫 𝑉) ∧ (𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁}))) → ∀𝑥 ∈ (𝑉 ∖ {𝑁})(𝑒 = {𝑥, 𝑁} ↔ 𝑥 = 𝑎))
5335, 52jca 553 . . . . . . 7 (((𝑁𝑉𝑒 ∈ 𝒫 𝑉) ∧ (𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁}))) → (𝑎 ∈ (𝑉 ∖ {𝑁}) ∧ ∀𝑥 ∈ (𝑉 ∖ {𝑁})(𝑒 = {𝑥, 𝑁} ↔ 𝑥 = 𝑎)))
5453ex 449 . . . . . 6 ((𝑁𝑉𝑒 ∈ 𝒫 𝑉) → ((𝑎𝑉 ∧ (𝑎𝑁𝑒 = {𝑎, 𝑁})) → (𝑎 ∈ (𝑉 ∖ {𝑁}) ∧ ∀𝑥 ∈ (𝑉 ∖ {𝑁})(𝑒 = {𝑥, 𝑁} ↔ 𝑥 = 𝑎))))
5554reximdv2 2997 . . . . 5 ((𝑁𝑉𝑒 ∈ 𝒫 𝑉) → (∃𝑎𝑉 (𝑎𝑁𝑒 = {𝑎, 𝑁}) → ∃𝑎 ∈ (𝑉 ∖ {𝑁})∀𝑥 ∈ (𝑉 ∖ {𝑁})(𝑒 = {𝑥, 𝑁} ↔ 𝑥 = 𝑎)))
5655expimpd 627 . . . 4 (𝑁𝑉 → ((𝑒 ∈ 𝒫 𝑉 ∧ ∃𝑎𝑉 (𝑎𝑁𝑒 = {𝑎, 𝑁})) → ∃𝑎 ∈ (𝑉 ∖ {𝑁})∀𝑥 ∈ (𝑉 ∖ {𝑁})(𝑒 = {𝑥, 𝑁} ↔ 𝑥 = 𝑎)))
57 eqeq1 2614 . . . . . . 7 (𝑥 = 𝑒 → (𝑥 = {𝑎, 𝑁} ↔ 𝑒 = {𝑎, 𝑁}))
5857anbi2d 736 . . . . . 6 (𝑥 = 𝑒 → ((𝑎𝑁𝑥 = {𝑎, 𝑁}) ↔ (𝑎𝑁𝑒 = {𝑎, 𝑁})))
5958rexbidv 3034 . . . . 5 (𝑥 = 𝑒 → (∃𝑎𝑉 (𝑎𝑁𝑥 = {𝑎, 𝑁}) ↔ ∃𝑎𝑉 (𝑎𝑁𝑒 = {𝑎, 𝑁})))
6059, 18elrab2 3333 . . . 4 (𝑒𝑃 ↔ (𝑒 ∈ 𝒫 𝑉 ∧ ∃𝑎𝑉 (𝑎𝑁𝑒 = {𝑎, 𝑁})))
61 reu6 3362 . . . 4 (∃!𝑥 ∈ (𝑉 ∖ {𝑁})𝑒 = {𝑥, 𝑁} ↔ ∃𝑎 ∈ (𝑉 ∖ {𝑁})∀𝑥 ∈ (𝑉 ∖ {𝑁})(𝑒 = {𝑥, 𝑁} ↔ 𝑥 = 𝑎))
6256, 60, 613imtr4g 284 . . 3 (𝑁𝑉 → (𝑒𝑃 → ∃!𝑥 ∈ (𝑉 ∖ {𝑁})𝑒 = {𝑥, 𝑁}))
6362ralrimiv 2948 . 2 (𝑁𝑉 → ∀𝑒𝑃 ∃!𝑥 ∈ (𝑉 ∖ {𝑁})𝑒 = {𝑥, 𝑁})
64 cusgrfi.f . . 3 𝐹 = (𝑥 ∈ (𝑉 ∖ {𝑁}) ↦ {𝑥, 𝑁})
6564f1ompt 6290 . 2 (𝐹:(𝑉 ∖ {𝑁})–1-1-onto𝑃 ↔ (∀𝑥 ∈ (𝑉 ∖ {𝑁}){𝑥, 𝑁} ∈ 𝑃 ∧ ∀𝑒𝑃 ∃!𝑥 ∈ (𝑉 ∖ {𝑁})𝑒 = {𝑥, 𝑁}))
6630, 63, 65sylanbrc 695 1 (𝑁𝑉𝐹:(𝑉 ∖ {𝑁})–1-1-onto𝑃)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  ∃wrex 2897  ∃!wreu 2898  {crab 2900   ∖ cdif 3537  𝒫 cpw 4108  {csn 4125  {cpr 4127   ↦ cmpt 4643  –1-1-onto→wf1o 5803  ‘cfv 5804  Vtxcvtx 25673 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812 This theorem is referenced by:  cusgrfilem3  40673
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