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Theorem grlicen 49209
Description: Locally isomorphic graphs have equinumerous sets of vertices. (Contributed by AV, 11-Jun-2025.)
Hypotheses
Ref Expression
grlicen.b 𝐵 = (Vtx‘𝑅)
grlicen.c 𝐶 = (Vtx‘𝑆)
Assertion
Ref Expression
grlicen (𝑅 ≃𝑙𝑔𝑟 𝑆 → 𝐵 ≈ 𝐶)

Proof of Theorem grlicen
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 brgrlic 49196 . 2 (𝑅 ≃𝑙𝑔𝑟 𝑆 ↔ (𝑅 GraphLocIso 𝑆) ≠ ∅)
2 n0 4299 . . 3 ((𝑅 GraphLocIso 𝑆) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝑅 GraphLocIso 𝑆))
3 grlicen.b . . . . . 6 𝐵 = (Vtx‘𝑅)
4 grlicen.c . . . . . 6 𝐶 = (Vtx‘𝑆)
53, 4grlimf1o 49177 . . . . 5 (𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝑓:𝐵–1-1-onto→𝐶)
63fvexi 6900 . . . . . 6 𝐵 ∈ V
76f1oen 9003 . . . . 5 (𝑓:𝐵–1-1-onto→𝐶 → 𝐵 ≈ 𝐶)
85, 7syl 18 . . . 4 (𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝐵 ≈ 𝐶)
98exlimiv 1962 . . 3 (∃𝑓 𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝐵 ≈ 𝐶)
102, 9sylbi 220 . 2 ((𝑅 GraphLocIso 𝑆) ≠ ∅ → 𝐵 ≈ 𝐶)
111, 10sylbi 220 1 (𝑅 ≃𝑙𝑔𝑟 𝑆 → 𝐵 ≈ 𝐶)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569  ∃wex 1811   ∈ wcel 2144   ≠ wne 2955  ∅c0 4278   class class class wbr 5102  –1-1-onto→wf1o 6538  ‘cfv 6539  (class class class)co 7421   ≈ cen 8974  Vtxcvtx 29580   GraphLocIso cgrlim 49168   ≃𝑙𝑔𝑟 cgrlic 49169
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7752
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-suc 6368  df-iota 6494  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-f1o 6546  df-fv 6547  df-ov 7424  df-oprab 7425  df-mpo 7426  df-1st 8002  df-2nd 8003  df-1o 8480  df-en 8978  df-grlim 49170  df-grlic 49173
This theorem is used by: (None)
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