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Theorem usgredg2vtxeuALT 29515
Description: Alternate proof of usgredg2vtxeu 29514, using edgiedgb 29347, the general translation from (iEdg‘𝐺) to (Edg‘𝐺). (Contributed by AV, 18-Oct-2020.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
usgredg2vtxeuALT ((𝐺 ∈ USGraph ∧ 𝐸 ∈ (Edg‘𝐺) ∧ 𝑌𝐸) → ∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦})
Distinct variable groups:   𝑦,𝐸   𝑦,𝐺   𝑦,𝑌

Proof of Theorem usgredg2vtxeuALT
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 usgruhgr 29479 . . . 4 (𝐺 ∈ USGraph → 𝐺 ∈ UHGraph)
2 eqid 2769 . . . . 5 (iEdg‘𝐺) = (iEdg‘𝐺)
32uhgredgiedgb 29419 . . . 4 (𝐺 ∈ UHGraph → (𝐸 ∈ (Edg‘𝐺) ↔ ∃𝑥 ∈ dom (iEdg‘𝐺)𝐸 = ((iEdg‘𝐺)‘𝑥)))
41, 3syl 18 . . 3 (𝐺 ∈ USGraph → (𝐸 ∈ (Edg‘𝐺) ↔ ∃𝑥 ∈ dom (iEdg‘𝐺)𝐸 = ((iEdg‘𝐺)‘𝑥)))
5 eqid 2769 . . . . . . . . 9 (Vtx‘𝐺) = (Vtx‘𝐺)
65, 2usgredgreu 29511 . . . . . . . 8 ((𝐺 ∈ USGraph ∧ 𝑥 ∈ dom (iEdg‘𝐺) ∧ 𝑌 ∈ ((iEdg‘𝐺)‘𝑥)) → ∃!𝑦 ∈ (Vtx‘𝐺)((iEdg‘𝐺)‘𝑥) = {𝑌, 𝑦})
763expia 1137 . . . . . . 7 ((𝐺 ∈ USGraph ∧ 𝑥 ∈ dom (iEdg‘𝐺)) → (𝑌 ∈ ((iEdg‘𝐺)‘𝑥) → ∃!𝑦 ∈ (Vtx‘𝐺)((iEdg‘𝐺)‘𝑥) = {𝑌, 𝑦}))
873adant3 1148 . . . . . 6 ((𝐺 ∈ USGraph ∧ 𝑥 ∈ dom (iEdg‘𝐺) ∧ 𝐸 = ((iEdg‘𝐺)‘𝑥)) → (𝑌 ∈ ((iEdg‘𝐺)‘𝑥) → ∃!𝑦 ∈ (Vtx‘𝐺)((iEdg‘𝐺)‘𝑥) = {𝑌, 𝑦}))
9 eleq2 2858 . . . . . . . 8 (𝐸 = ((iEdg‘𝐺)‘𝑥) → (𝑌𝐸𝑌 ∈ ((iEdg‘𝐺)‘𝑥)))
10 eqeq1 2773 . . . . . . . . 9 (𝐸 = ((iEdg‘𝐺)‘𝑥) → (𝐸 = {𝑌, 𝑦} ↔ ((iEdg‘𝐺)‘𝑥) = {𝑌, 𝑦}))
1110reubidv 3392 . . . . . . . 8 (𝐸 = ((iEdg‘𝐺)‘𝑥) → (∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦} ↔ ∃!𝑦 ∈ (Vtx‘𝐺)((iEdg‘𝐺)‘𝑥) = {𝑌, 𝑦}))
129, 11imbi12d 347 . . . . . . 7 (𝐸 = ((iEdg‘𝐺)‘𝑥) → ((𝑌𝐸 → ∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦}) ↔ (𝑌 ∈ ((iEdg‘𝐺)‘𝑥) → ∃!𝑦 ∈ (Vtx‘𝐺)((iEdg‘𝐺)‘𝑥) = {𝑌, 𝑦})))
13123ad2ant3 1151 . . . . . 6 ((𝐺 ∈ USGraph ∧ 𝑥 ∈ dom (iEdg‘𝐺) ∧ 𝐸 = ((iEdg‘𝐺)‘𝑥)) → ((𝑌𝐸 → ∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦}) ↔ (𝑌 ∈ ((iEdg‘𝐺)‘𝑥) → ∃!𝑦 ∈ (Vtx‘𝐺)((iEdg‘𝐺)‘𝑥) = {𝑌, 𝑦})))
148, 13mpbird 260 . . . . 5 ((𝐺 ∈ USGraph ∧ 𝑥 ∈ dom (iEdg‘𝐺) ∧ 𝐸 = ((iEdg‘𝐺)‘𝑥)) → (𝑌𝐸 → ∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦}))
15143exp 1135 . . . 4 (𝐺 ∈ USGraph → (𝑥 ∈ dom (iEdg‘𝐺) → (𝐸 = ((iEdg‘𝐺)‘𝑥) → (𝑌𝐸 → ∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦}))))
1615rexlimdv 3170 . . 3 (𝐺 ∈ USGraph → (∃𝑥 ∈ dom (iEdg‘𝐺)𝐸 = ((iEdg‘𝐺)‘𝑥) → (𝑌𝐸 → ∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦})))
174, 16sylbid 243 . 2 (𝐺 ∈ USGraph → (𝐸 ∈ (Edg‘𝐺) → (𝑌𝐸 → ∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦})))
18173imp 1126 1 ((𝐺 ∈ USGraph ∧ 𝐸 ∈ (Edg‘𝐺) ∧ 𝑌𝐸) → ∃!𝑦 ∈ (Vtx‘𝐺)𝐸 = {𝑌, 𝑦})
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  w3a 1101   = wceq 1567  wcel 2149  wrex 3095  ∃!wreu 3374  {cpr 4596  dom cdm 5664  cfv 6539  Vtxcvtx 29289  iEdgciedg 29290  Edgcedg 29340  UHGraphcuhgr 29349  USGraphcusgr 29442
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5261  ax-nul 5273  ax-pow 5339  ax-pr 5407  ax-un 7735  ax-cnex 11158  ax-resscn 11159  ax-1cn 11160  ax-icn 11161  ax-addcl 11162  ax-addrcl 11163  ax-mulcl 11164  ax-mulrcl 11165  ax-mulcom 11166  ax-addass 11167  ax-mulass 11168  ax-distr 11169  ax-i2m1 11170  ax-1ne0 11171  ax-1rid 11172  ax-rnegex 11173  ax-rrecex 11174  ax-cnre 11175  ax-pre-lttri 11176  ax-pre-lttrn 11177  ax-pre-ltadd 11178  ax-pre-mulgt0 11179
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-nel 3071  df-ral 3086  df-rex 3096  df-rmo 3376  df-reu 3377  df-rab 3424  df-v 3465  df-sbc 3754  df-csb 3862  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-pss 3933  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-int 4917  df-iun 4962  df-br 5114  df-opab 5178  df-mpt 5197  df-tr 5223  df-id 5559  df-eprel 5564  df-po 5572  df-so 5573  df-fr 5617  df-we 5619  df-xp 5670  df-rel 5671  df-cnv 5672  df-co 5673  df-dm 5674  df-rn 5675  df-res 5676  df-ima 5677  df-pred 6305  df-ord 6366  df-on 6367  df-lim 6368  df-suc 6369  df-iota 6495  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-f1o 6546  df-fv 6547  df-riota 7370  df-ov 7416  df-oprab 7417  df-mpo 7418  df-om 7865  df-1st 7988  df-2nd 7989  df-frecs 8280  df-wrecs 8311  df-recs 8360  df-rdg 8399  df-1o 8455  df-2o 8456  df-oadd 8459  df-er 8696  df-en 8946  df-dom 8947  df-sdom 8948  df-fin 8949  df-dju 9889  df-card 9927  df-pnf 11247  df-mnf 11248  df-xr 11249  df-ltxr 11250  df-le 11251  df-sub 11445  df-neg 11446  df-nn 12236  df-2 12305  df-n0 12507  df-z 12594  df-uz 12865  df-fz 13538  df-hash 14369  df-edg 29341  df-uhgr 29351  df-upgr 29375  df-umgr 29376  df-uspgr 29443  df-usgr 29444
This theorem is referenced by: (None)
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