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Theorem isrim0 18489
Description: An isomorphism of rings is a homomorphism whose converse is also a homomorphism . (Contributed by AV, 22-Oct-2019.)
Assertion
Ref Expression
isrim0 ((𝑅𝑉𝑆𝑊) → (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ (𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐹 ∈ (𝑆 RingHom 𝑅))))

Proof of Theorem isrim0
Dummy variables 𝑓 𝑟 𝑠 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-rngiso 18482 . . . . 5 RingIso = (𝑟 ∈ V, 𝑠 ∈ V ↦ {𝑓 ∈ (𝑟 RingHom 𝑠) ∣ 𝑓 ∈ (𝑠 RingHom 𝑟)})
21a1i 11 . . . 4 ((𝑅𝑉𝑆𝑊) → RingIso = (𝑟 ∈ V, 𝑠 ∈ V ↦ {𝑓 ∈ (𝑟 RingHom 𝑠) ∣ 𝑓 ∈ (𝑠 RingHom 𝑟)}))
3 oveq12 6533 . . . . . 6 ((𝑟 = 𝑅𝑠 = 𝑆) → (𝑟 RingHom 𝑠) = (𝑅 RingHom 𝑆))
43adantl 480 . . . . 5 (((𝑅𝑉𝑆𝑊) ∧ (𝑟 = 𝑅𝑠 = 𝑆)) → (𝑟 RingHom 𝑠) = (𝑅 RingHom 𝑆))
5 oveq12 6533 . . . . . . . 8 ((𝑠 = 𝑆𝑟 = 𝑅) → (𝑠 RingHom 𝑟) = (𝑆 RingHom 𝑅))
65ancoms 467 . . . . . . 7 ((𝑟 = 𝑅𝑠 = 𝑆) → (𝑠 RingHom 𝑟) = (𝑆 RingHom 𝑅))
76adantl 480 . . . . . 6 (((𝑅𝑉𝑆𝑊) ∧ (𝑟 = 𝑅𝑠 = 𝑆)) → (𝑠 RingHom 𝑟) = (𝑆 RingHom 𝑅))
87eleq2d 2669 . . . . 5 (((𝑅𝑉𝑆𝑊) ∧ (𝑟 = 𝑅𝑠 = 𝑆)) → (𝑓 ∈ (𝑠 RingHom 𝑟) ↔ 𝑓 ∈ (𝑆 RingHom 𝑅)))
94, 8rabeqbidv 3164 . . . 4 (((𝑅𝑉𝑆𝑊) ∧ (𝑟 = 𝑅𝑠 = 𝑆)) → {𝑓 ∈ (𝑟 RingHom 𝑠) ∣ 𝑓 ∈ (𝑠 RingHom 𝑟)} = {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ 𝑓 ∈ (𝑆 RingHom 𝑅)})
10 elex 3181 . . . . 5 (𝑅𝑉𝑅 ∈ V)
1110adantr 479 . . . 4 ((𝑅𝑉𝑆𝑊) → 𝑅 ∈ V)
12 elex 3181 . . . . 5 (𝑆𝑊𝑆 ∈ V)
1312adantl 480 . . . 4 ((𝑅𝑉𝑆𝑊) → 𝑆 ∈ V)
14 ovex 6552 . . . . . 6 (𝑅 RingHom 𝑆) ∈ V
1514rabex 4732 . . . . 5 {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ 𝑓 ∈ (𝑆 RingHom 𝑅)} ∈ V
1615a1i 11 . . . 4 ((𝑅𝑉𝑆𝑊) → {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ 𝑓 ∈ (𝑆 RingHom 𝑅)} ∈ V)
172, 9, 11, 13, 16ovmpt2d 6661 . . 3 ((𝑅𝑉𝑆𝑊) → (𝑅 RingIso 𝑆) = {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ 𝑓 ∈ (𝑆 RingHom 𝑅)})
1817eleq2d 2669 . 2 ((𝑅𝑉𝑆𝑊) → (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ 𝐹 ∈ {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ 𝑓 ∈ (𝑆 RingHom 𝑅)}))
19 cnveq 5203 . . . 4 (𝑓 = 𝐹𝑓 = 𝐹)
2019eleq1d 2668 . . 3 (𝑓 = 𝐹 → (𝑓 ∈ (𝑆 RingHom 𝑅) ↔ 𝐹 ∈ (𝑆 RingHom 𝑅)))
2120elrab 3327 . 2 (𝐹 ∈ {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ 𝑓 ∈ (𝑆 RingHom 𝑅)} ↔ (𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐹 ∈ (𝑆 RingHom 𝑅)))
2218, 21syl6bb 274 1 ((𝑅𝑉𝑆𝑊) → (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ (𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐹 ∈ (𝑆 RingHom 𝑅))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 194  wa 382   = wceq 1474  wcel 1976  {crab 2896  Vcvv 3169  ccnv 5024  (class class class)co 6524  cmpt2 6526   RingHom crh 18478   RingIso crs 18479
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1712  ax-4 1727  ax-5 1826  ax-6 1874  ax-7 1921  ax-9 1985  ax-10 2005  ax-11 2020  ax-12 2032  ax-13 2229  ax-ext 2586  ax-sep 4700  ax-nul 4709  ax-pr 4825
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1700  df-sb 1867  df-eu 2458  df-mo 2459  df-clab 2593  df-cleq 2599  df-clel 2602  df-nfc 2736  df-ral 2897  df-rex 2898  df-rab 2901  df-v 3171  df-sbc 3399  df-dif 3539  df-un 3541  df-in 3543  df-ss 3550  df-nul 3871  df-if 4033  df-sn 4122  df-pr 4124  df-op 4128  df-uni 4364  df-br 4575  df-opab 4635  df-id 4940  df-xp 5031  df-rel 5032  df-cnv 5033  df-co 5034  df-dm 5035  df-iota 5751  df-fun 5789  df-fv 5795  df-ov 6527  df-oprab 6528  df-mpt2 6529  df-rngiso 18482
This theorem is referenced by:  isrim  18499  brric2  18511  ringcinv  41823  ringcinvALTV  41847
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