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Theorem grlicen 48823
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 (𝑅𝑙𝑔𝑟 𝑆𝐵𝐶)

Proof of Theorem grlicen
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 brgrlic 48810 . 2 (𝑅𝑙𝑔𝑟 𝑆 ↔ (𝑅 GraphLocIso 𝑆) ≠ ∅)
2 n0 4310 . . 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 48791 . . . . 5 (𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝑓:𝐵1-1-onto𝐶)
63fvexi 6902 . . . . . 6 𝐵 ∈ V
76f1oen 8978 . . . . 5 (𝑓:𝐵1-1-onto𝐶𝐵𝐶)
85, 7syl 18 . . . 4 (𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝐵𝐶)
98exlimiv 1963 . . 3 (∃𝑓 𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝐵𝐶)
102, 9sylbi 220 . 2 ((𝑅 GraphLocIso 𝑆) ≠ ∅ → 𝐵𝐶)
111, 10sylbi 220 1 (𝑅𝑙𝑔𝑟 𝑆𝐵𝐶)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4   = wceq 1570  wex 1812  wcel 2146  wne 2961  c0 4289   class class class wbr 5114  1-1-ontowf1o 6542  cfv 6543  (class class class)co 7423  cen 8949  Vtxcvtx 29383   GraphLocIso cgrlim 48782  𝑙𝑔𝑟 cgrlic 48783
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2738  ax-rep 5243  ax-sep 5262  ax-nul 5274  ax-pow 5341  ax-pr 5409  ax-un 7745
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2570  df-eu 2600  df-clab 2745  df-cleq 2758  df-clel 2841  df-nfc 2915  df-ne 2962  df-ral 3083  df-rex 3093  df-reu 3373  df-rab 3420  df-v 3460  df-sbc 3748  df-csb 3857  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4878  df-iun 4963  df-br 5115  df-opab 5179  df-mpt 5198  df-id 5561  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-res 5678  df-ima 5679  df-suc 6373  df-iota 6499  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-ov 7426  df-oprab 7427  df-mpo 7428  df-1st 7995  df-2nd 7996  df-1o 8462  df-en 8953  df-grlim 48784  df-grlic 48787
This theorem is used by: (None)
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