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Theorem grlicen 48371
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 48358 . 2 (𝑅𝑙𝑔𝑟 𝑆 ↔ (𝑅 GraphLocIso 𝑆) ≠ ∅)
2 n0 4307 . . 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 48339 . . . . 5 (𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝑓:𝐵1-1-onto𝐶)
63fvexi 6856 . . . . . 6 𝐵 ∈ V
76f1oen 8921 . . . . 5 (𝑓:𝐵1-1-onto𝐶𝐵𝐶)
85, 7syl 17 . . . 4 (𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝐵𝐶)
98exlimiv 1932 . . 3 (∃𝑓 𝑓 ∈ (𝑅 GraphLocIso 𝑆) → 𝐵𝐶)
102, 9sylbi 217 . 2 ((𝑅 GraphLocIso 𝑆) ≠ ∅ → 𝐵𝐶)
111, 10sylbi 217 1 (𝑅𝑙𝑔𝑟 𝑆𝐵𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1542  wex 1781  wcel 2114  wne 2933  c0 4287   class class class wbr 5100  1-1-ontowf1o 6499  cfv 6500  (class class class)co 7368  cen 8892  Vtxcvtx 29081   GraphLocIso cgrlim 48330  𝑙𝑔𝑟 cgrlic 48331
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5226  ax-sep 5243  ax-nul 5253  ax-pow 5312  ax-pr 5379  ax-un 7690
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-reu 3353  df-rab 3402  df-v 3444  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-iun 4950  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-suc 6331  df-iota 6456  df-fun 6502  df-fn 6503  df-f 6504  df-f1 6505  df-fo 6506  df-f1o 6507  df-fv 6508  df-ov 7371  df-oprab 7372  df-mpo 7373  df-1st 7943  df-2nd 7944  df-1o 8407  df-en 8896  df-grlim 48332  df-grlic 48335
This theorem is referenced by: (None)
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