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Theorem brpermmodelcnv 45972
Description: Ordinary membership expressed in terms of the permutation model's membership relation. (Contributed by Eric Schmidt, 6-Nov-2025.)
Hypotheses
Ref Expression
permmodel.1 𝐹:V–1-1-onto→V
permmodel.2 𝑅 = (◡𝐹 ∘ E )
brpermmodel.3 𝐴 ∈ V
brpermmodel.4 𝐵 ∈ V
Assertion
Ref Expression
brpermmodelcnv (𝐴𝑅(◡𝐹‘𝐵) ↔ 𝐴 ∈ 𝐵)

Proof of Theorem brpermmodelcnv
StepHypRef Expression
1 permmodel.1 . . 3 𝐹:V–1-1-onto→V
2 permmodel.2 . . 3 𝑅 = (◡𝐹 ∘ E )
3 brpermmodel.3 . . 3 𝐴 ∈ V
4 fvex 6896 . . 3 (◡𝐹‘𝐵) ∈ V
51, 2, 3, 4brpermmodel 45971 . 2 (𝐴𝑅(◡𝐹‘𝐵) ↔ 𝐴 ∈ (𝐹‘(◡𝐹‘𝐵)))
6 brpermmodel.4 . . . 4 𝐵 ∈ V
7 f1ocnvfv2 7283 . . . 4 ((𝐹:V–1-1-onto→V ∧ 𝐵 ∈ V) → (𝐹‘(◡𝐹‘𝐵)) = 𝐵)
81, 6, 7mp2an 705 . . 3 (𝐹‘(◡𝐹‘𝐵)) = 𝐵
98eleq2i 2853 . 2 (𝐴 ∈ (𝐹‘(◡𝐹‘𝐵)) ↔ 𝐴 ∈ 𝐵)
105, 9bitri 278 1 (𝐴𝑅(◡𝐹‘𝐵) ↔ 𝐴 ∈ 𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ↔ wb 209   = wceq 1570   ∈ wcel 2145  Vcvv 3451   class class class wbr 5103   E cep 5550  ◡ccnv 5650   ∘ ccom 5655  –1-1-onto→wf1o 6536  ‘cfv 6537
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 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pr 5391
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 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-id 5546  df-eprel 5551  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-f1 6542  df-fo 6543  df-f1o 6544  df-fv 6545
This theorem is used by:  permaxsep  45975  permaxnul  45976  permaxpow  45977  permaxpr  45978  permaxun  45979  permaxinf2lem  45980  permac8prim  45982
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